10 Best RV Winterizing Kits With Valve for Air or Antifreeze

Winterizing comes down to one choice: push the water out with air, or fill the lines with antifreeze. The winterizing kit picks below split on that, plus how they connect, how much hose you get, and whether the valve stays on your rig all year. Here’s what separates them.

Best overall: Dual Purpose RV Winterizing Kit — lead-free brass body, a 0-100 psi gauge, and a shut-off valve so you adjust airflow at the hose instead of walking back to the compressor.

Best for antifreeze fill: Camco Permanent Pump Converter — a brass three-way valve that installs in-line with your water pump and stays there, so you draw antifreeze straight from the jug.

Simplest to own: Camco Brass Blow Out Plug — one brass plug with a Schrader valve, no gauge, no hose, nothing to store or lose between seasons.

The rest of this guide walks through each kit, then answers the questions that come up before you order.

How We Picked

All 10 products side by side — scroll sideways to see every column.

1. Dual Purpose RV Winterizing Kit

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Best for: the owner who wants one kit for everything

This kit’s selling point is the gauge and valve sitting together on the hose. You read pressure at the point of use and adjust airflow with the same hand, which matters because you’re watching a gauge while cracking a faucet open somewhere else. The 0-100 psi range covers the low pressures RV lines want.

The brass is certified to contain less than 0.25% lead, and the 17-inch hybrid rubber hose is rated to 300 PSI with a temperature range of -22°F to +250°F.

Connections are a 1/4-inch air quick plug plus 3/4-inch male and female garden hose threads, and a roll of Teflon tape comes in the box. The male thread handles RV, camper, boat, and travel trailer; the included female-to-female converter opens up sprinkler systems and outdoor plumbing.

Pros

• Gauge and shut-off valve combined in a single fitting
• Lead-free brass certified under 0.25% lead
• 17-inch hose reaches tight spaces

Cons

• Female-to-female converter needed for sprinkler lines
• No water heater bypass parts included

2. Upgraded RV Winterizing Kit

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Best for: the buyer who wants the longest hose in the box

Boltigen’s kit leads with a 60-inch hose, which is the number that changes how you work. You can set the compressor on the ground and still reach the city water inlet without dragging anything across the driveway. The gauge reads 0-80 psi in a metal case, and the shut-off valve lets you control flow from the same spot.

The adapter and connectors are brass with frosted surface parts, the hose is flexible reinforced synthetic rubber described as waterproof and corrosion-resistant, and the shut-off valve is zinc alloy.

Connections cover 3/4-inch GHT male and female ports for RV, camper, boat, travel trailer, garden hose, and sprinkler systems. The box includes the hose with gauge, a female-to-female adapter, two seal washers, and thread sealing tape. Boltigen states a 12-month warranty and 24/7 customer service. Skip this one if you want a permanent in-line install — it’s a hose-end tool, not a plumbed part.

Pros

• 60-inch hose gives real working reach
• 12-month warranty with 24/7 support stated
• Two seal washers and tape included

Cons

• Shut-off valve is zinc alloy, not brass
• Gauge tops out at 80 psi

3. Camco Permanent Pump Converter Winterizing Kit- Allows You to Use

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Best for: the owner who winterizes with antifreeze

Instead of blowing air, you mount a brass three-way valve in-line with your water pump and use the pump itself to pull antifreeze out of the jug and through your plumbing. The siphon tube does the transfer, and once it’s installed it stays installed — no annual teardown.

It fits any water pump with 1/2″-14 NPT or NPSM ports, so check your pump’s port size before ordering. The kit includes the brass valve, siphon tube, Teflon tape, and two pump adapter fittings.

Camco states it works alongside their Water Heater By-Pass Kit (SKUs 35953, 35963, 35983, 37463) to conserve antifreeze, and the valve is CSA Low Lead Content Certified to NSF/ANSI 372. If you’d rather not cut into your pump line at all, this isn’t your pick.

Pros

• Permanent install, no yearly reassembly
• CSA Low Lead Content Certified to NSF/ANSI 372
• Pairs with Camco bypass kits to save antifreeze

Cons

• Water pump not included
• Requires 1/2″-14 NPT or NPSM pump ports

4. Camco RV Brass Blow Out Plug

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Best for: the minimalist who wants a single brass fitting

There’s nothing to adjust here, and that’s the point. You screw this plug into your city water inlet, open every faucet and drain, hook up an air compressor, and let the air push the water out. No gauge to read, no valve to set, no hose to coil up in spring.

The Schrader valve makes it compatible with most air compressors that use a standard tire inflator attachment, which is the connection most people already own. Camco describes the body as heavy-duty brass with a patented design, and it’s built to be used season after season.

The listing describes it only as a blowout tool for clearing water lines. If you want to see the number on a dial while you work, one of the gauge kits above suits you better.

Pros

• A single brass piece, nothing to store
• Schrader valve fits standard inflator attachments
• Heavy-duty brass, patented design

Cons

• No pressure gauge or shut-off valve
• Pressure set only at the compressor

5. Lead-Free Brass 17″ Kit

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Best for: the buyer who needs flexible reach and adapters

WINAMOO’s kit is built around a 17-inch premium rubber hose with a 3/8-inch inner diameter, described as waterproof with heat, cold, and corrosion resistance. The flexibility is what you’re buying: a hose that bends into a tight bay without kinking puts less stress on the pipe thread you’re screwing into.

The metal parts are solid lead-free brass certified to contain less than 0.25% lead, and the connection set is a 1/4-inch air quick plug with 3/4-inch female and male garden hose threads. A shut-off ball valve sits on the hose so you can limit airflow and cut it at one central spot rather than at the compressor.

In the box you get the rubber hose with ball valve and GHT male connector, an RV brass blow out plug, a 1/4-inch male quick plug, a GHT female adapter with silicone gasket, and sealing tape. It covers RV, motorhome, camper, boat, watercraft, and travel trailer, plus sprinklers and hose bibbs with the extra converters. There’s no pressure gauge, so if you want a dial reading, look elsewhere.

Pros

• 17-inch hose with 3/8-inch inner diameter
• Shut-off ball valve on the hose
• Full adapter set with silicone gasket

Cons

• No pressure gauge included
• Ball valve position fixed on the hose

6. Hourleey RV Winterizer Kit

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Best for: the homeowner winterizing sprinklers and RV lines

Hourleey’s 18.5-inch hose is the longest of the rubber-hose kits here, and the listing says it bends 180° without kinking. That’s the spec that matters when you’re reaching a sprinkler blowout port set low in the ground or an inlet tucked behind a bumper.

The metal parts are solid lead-free brass that resists rust, and the hose is durable synthetic rubber. Pressure rating is 300 PSI with a temperature range of -22°F to +250°F. Connections are a 1/4-inch quick connect plug and a garden hose connector, compatible with standard garden hose threading and the quick-connect systems common across North America.

The package includes the 18.5-inch kit with shut-off valve, a male and a female garden hose connector, and Teflon tape. The male fitting suits RVs, campers, boats, and travel trailers; the female connector is aimed at outdoor plumbing and garden hoses. There’s no gauge, and no antifreeze hardware — this is an air-only tool.

Pros

• 18.5-inch hose bends 180° without kinking
• 300 PSI rating, -22°F to +250°F range
• Male and female garden hose connectors included

Cons

• No pressure gauge
• Air blowout only, no antifreeze parts

7. Camco Camper/RV Water Heater By-Pass Kit

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Best for: the antifreeze user who wants to stop wasting it

Camco states this bypass saves 6-10 gallons of antifreeze every cycle by routing flow around the tank instead of filling it. That’s the whole case for the part.

It fits 6-gallon RV water heater tanks with 1/2″-14 NPT tapered threads and includes brass fittings. The kit has an 8-inch crimp-proof bypass hose, two three-way brass bypass valves with shutoff, and Teflon tape. The valve handles carry flow indicators, so you can see at a glance whether you’re in open or bypass position — useful when you’re upside down in a cabinet.

It mounts permanently, so you install once and skip the annual disconnect. This isn’t a standalone winterizing solution: it’s a companion to a pump converter or a blowout kit, and it does nothing on its own.

Pros

• Saves 6-10 gallons of antifreeze per cycle
• Flow indicators on both valve handles
• Permanent mount, no yearly removal

Cons

• Fits 6-gallon tanks only
• Does nothing without a separate winterizing kit

8. RecPro RV 1/2″ Three-Way Water Heater Bypass Valve

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Best for: the owner replacing a single valve, not a whole kit

This is a single part for a single job. RecPro’s three-way valve goes into an RV water heater system that already uses a two-valve setup, and it redirects water flow away from the heater so antifreeze stays in your lines instead of filling the tank.

The connections are 1/2-inch barbed, which means you’re clamping it onto hose rather than threading it onto a port. That’s a different install than the Camco bypass kit above, and it’s the detail to check before you order: barbed fittings need hose and clamps, threaded fittings need matching ports.

The listing is short and doesn’t state materials, warranty, or what’s in the box beyond the valve itself. What it does state is the function: keeps antifreeze out of the water heater tank and in the water lines. If you need the full assembly with hose and two valves, this isn’t it.

Pros

• Three-way valve for two-valve systems
• Keeps antifreeze out of the heater tank
• 1/2-inch barbed connections

Cons

• Valve only, no hose or fittings

9. Boat & RV Antifreeze Tank

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Best for: the boater winterizing an inboard or outboard engine

This is a gravity-flow system built around a 5-gallon antifreeze tank with an on/off valve. You fill the tank, and the high-flow fittings feed antifreeze through a reinforced clear hose so you can watch it move. The clear hose is the practical touch — you see the flow instead of guessing.

The kit includes the tank with on/off valve, a T-connector, a shutoff valve, and the reinforced clear hose with fittings. Better Boat states it works with most inboard and outboard engines, and that it’s meant for flushing and protecting the engine during the off-season.

Two things to know before ordering. The listing says not to connect it to the suction of the raw water pump. And you need separate antifreeze plus motor muffs or a pump adapter, sold separately. That makes this a tank and hose system, not a complete winterizing solution.

Pros

• 5-gallon tank with on/off valve
• Clear hose shows antifreeze flow
• Fits most inboard and outboard engines

Cons

• Antifreeze and muffs sold separately
• Not for connecting to raw water pump suction

10. Thetford Winterizing Diverter Valve PN 94230

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Best for: the buyer who needs a specific replacement part

Thetford’s listing is thin, and that’s worth saying plainly. It identifies the product as a winterizing diverter valve, part number 94230, made in the United States, with package dimensions of roughly 8.1 by 11.6 by 15.6 centimeters.

There’s no stated material, no thread dimensions, no compatibility list, and no description of how it installs. For a diverter valve, the thread dimensions are the spec you’d want before ordering, and they aren’t here.

What you’re getting is a Thetford-branded part with a known part number, which helps if you’re matching an existing valve on your rig or replacing a failed one. If you’re starting from scratch, the listing won’t tell you what it connects to. Buy this as a replacement, not as a first kit.

Pros

• Thetford part number 94230 for matching
• Made in the United States
• Compact package dimensions listed

Cons

• No thread size or material stated
• No compatibility or install details given

Also Worth Considering

Three more listings turned up that fit the category but didn’t state enough to rank. RV Winterizing Kit Valve is a blowout adapter with a valve and plug aimed at sprinkler and camper lines. RV Shut Off Control Valve pairs a pressure gauge with a shut-off control valve, so it covers the same ground as the gauge kits above. RV Adapter Shut Off Valve is a blowout adapter with a shut-off valve for boats, campers, and trailers. Each names its main parts in the title, and each would need the listing read closely for thread sizes and materials before you’d know how it fits your rig.

How to Choose in Sixty Seconds

Should I blow out my lines or use antifreeze?

Blowout first, then decide if you need antifreeze at all. Compressed air through a blowout adapter clears standing water from the lines, and the listings here that use it — the Dual Purpose RV Winterizing Kit, the Lead-Free Brass 17″ Kit, the Hourleey kit — all work the same way: connect at the city water inlet, open every faucet and drain, and let air push the water out.

Antifreeze is the belt-and-suspenders step. It protects traps, pump seals, and any low spot air can’t clear. The Camco Permanent Pump Converter is built for that job, drawing antifreeze from a jug with your own water pump. Many owners do both: air first, antifreeze after. If you go the antifreeze route, the Camco Water Heater By-Pass keeps 6-10 gallons out of your heater tank each cycle.

What thread sizes do I need to check before ordering?

Three numbers decide whether a kit fits. The first is your air connection: 1/4-inch quick plug is the standard across these listings, and it matches most compressors. The second is your water inlet: standard garden hose thread covers RV city inlets, and every hose kit here has both male and female fittings.

The third is the one people overlook. If you’re plumbing in a pump converter or bypass valve, you need NPT sizes — the Camco Permanent Pump Converter wants 1/2″-14 NPT or NPSM pump ports, and the Camco Water Heater By-Pass fits 6-gallon tanks with 1/2″-14 NPT tapered threads. The RecPro valve uses 1/2-inch barbed connections instead, which need hose and clamps. Measure before you order.

Do I need a pressure gauge on my winterizing kit?

A gauge tells you what pressure is actually reaching your plumbing, and RV water lines aren’t built for shop-air pressures. That’s the argument for the Dual Purpose RV Winterizing Kit with its 0-100 psi dial, or the Boltigen kit at 0-80 psi. Both let you watch the number and dial the regulator down.

The counter-argument is simplicity. The Camco Brass Blow Out Plug has no gauge, and you set pressure at the compressor instead. That works fine if your compressor has a regulator you trust. The kits without gauges — the Lead-Free Brass 17″ Kit and the Hourleey kit — rely on the same approach. Pick based on whether you’d rather read a dial at the hose or at the tank.

Can I use one kit for both my RV and my sprinkler system?

Often, yes, but check the adapters. The Dual Purpose RV Winterizing Kit includes a female-to-female converter that opens up sprinkler systems and outdoor plumbing. The Lead-Free Brass 17″ Kit ships with a GHT female adapter and silicone gasket for the same purpose. The Hourleey kit includes both a male and female connector.

The catch is thread direction. RV city inlets take a male fitting; sprinkler blowout ports usually take a female. Kits that include both, like the Hourleey and the WINAMOO, cover either case without a trip to the hardware store. If you’re buying for sprinklers first, look for a kit that lists the female adapter explicitly — and note that sprinkler systems often want lower pressure than RV lines.

Frequently Asked Questions

What do I actually need to winterize an RV?

At minimum, you need a way to get water out of the lines and a way to protect what’s left. Air blowout covers the first part with a blowout adapter, an air compressor, and access to your city water inlet. Antifreeze covers the second, using a pump converter or a tank system. Add a water heater bypass if you use antifreeze.

How much antifreeze will I go through each winter?

Less than you’d think if you bypass the water heater. Camco states their Water Heater By-Pass Kit saves 6-10 gallons per winterizing cycle by routing flow around the tank instead of filling it. Without a bypass, that tank alone swallows most of a jug. Buy antifreeze separately — it isn’t included with any kit here.

What’s the first thing that goes wrong with these kits?

The connection, almost always. A kit that doesn’t match your inlet thread is useless, and the listings that state their sizes are the ones you can check in advance. The Dual Purpose RV Winterizing Kit and the Lead-Free Brass 17″ Kit both list 1/4-inch air quick plugs and male and female garden hose threads. Second most common: air leaks at the fitting.

Is the simplest kit on this list enough?

For a lot of rigs, yes. The Camco Brass Blow Out Plug does one job — screw it into the city water inlet, open the faucets and drains, connect a compressor, and push the water out. It’s compatible with most air compressors using a standard tire inflator attachment. What it won’t do is let you fine-tune pressure at the inlet or fill your lines with antifreeze.

Closing

For most people, the Dual Purpose RV Winterizing Kit is the pick: lead-free brass, a gauge and shut-off valve on the same body, and a 17-inch hose that reaches where you need it. If you winterize with antifreeze rather than air, the Camco Permanent Pump Converter is the second name to know — it installs once and pulls antifreeze through your own pump. Before you order anything, find your water inlet and your pump ports and write down the thread sizes. That one step decides which kit fits your rig.