If you are looking for a water back pressure valve for a hose connection, first identify whether you need protection against backflow, back-siphonage, or both. The products below include hose-bibb vacuum breakers for outdoor faucets and a double-check assembly designed to address backpressure and back-siphonage in piping. The two-pack suits buyers fitting multiple hose connections; Eastman is a self-draining single-unit option; and the double-check assembly is the listing specifically describing backpressure protection.
| Product | Best suited for | Key distinction |
|---|---|---|
| Brass 3/4-Inch Vacuum Breaker, 2-Pack | Two standard hose connections | Includes washers and thread tape |
| Eastman 20199 Vacuum Breaker | A self-draining hose-bibb fitting | Break-off screw for permanent installation |
| PK1390 Replacement Vacuum Breaker | Buyers matching a specific threaded connection | Fine-thread inlet and GHT outlet |
| 1-350 Double Check Assembly | Continuous-pressure piping applications | Two check valves in series |
| SUNROAD Brass Vacuum Breakers, 3-Pack | Several outdoor hose outlets | Three fittings and two screw options |
Brass 3/4-Inch Vacuum Breaker, 2-Pack
This two-pack is best for homeowners who want backflow protection on two standard hose connections. Each fitting has a 3/4-inch female hose-thread inlet and a 3/4-inch male hose-thread outlet. The listing says the vacuum breaker is intended to prevent back-siphonage into the water supply and can be used with standard hoses, hose bibs, sillcocks, RV connections, garden spigots, and hydrants.
The package includes two washers and thread tape, making it a convenient choice for multiple installations. A break-off screw supports permanent attachment. The stated maximum operating pressure is 125 psi and the maximum operating temperature is 180°F. Avoid this option if your connection does not use the listed 3/4-inch hose threads.
Eastman 20199 Self-Draining Vacuum Breaker
The Eastman 20199 is best for buyers seeking a hose-bibb vacuum breaker with a self-draining mechanism. It is designed to prevent fluid from flowing back into the potable water system, and the listing says it drains water when the faucet is shut off. Its break-off screw is intended for permanent installation.
Choose this model if those features match your outdoor faucet setup and you want a single fitting from the Eastman brand. The provided product details do not specify operating pressure, temperature, or package extras, so check the product information and your faucet connection before purchasing. It is a vacuum breaker, not a general-purpose replacement for every backpressure-control application.
PK1390 Replacement Self-Draining Vacuum Breaker
This replacement fitting is best for buyers whose existing hose-bibb connection requires its specific thread combination: a 1-1/16-inch fine-thread female inlet and a 3/4-inch GHT male outlet. The listing also gives external and internal thread measurements, which can help with fit checks. It is described as a self-draining anti-siphon device with a drain hole and a break-off screw.
The product is listed as lead-free brass, with a maximum operating pressure of 125 psi and temperature of 180°F. Confirm the thread measurements against your existing fitting before ordering; the fine-thread inlet is not the same as a standard hose-thread inlet. The listing warns that water may spray from the drain when shutting off, so stand clear during operation.
1-350 Double Check Backflow Preventer
This assembly is best for buyers specifically seeking a valve described as preventing both backpressure backflow and back-siphonage. The listing positions it for irrigation contractors, continuous-pressure piping, cross-connections, and service-line entry points. It uses two check valves in series, so the second valve is intended to provide another barrier if the first does not close properly.
The stated construction combines stainless steel valves with reinforced nylon, and the assembly is described as detachable. This is a different type of product from a small hose-bibb vacuum breaker, so choose it only when its configuration suits the piping application. The supplied details do not provide connection dimensions or installation requirements; verify those before purchase and installation.
SUNROAD Brass Vacuum Breakers, 3-Pack
The SUNROAD three-pack is best for buyers protecting several outdoor hose outlets, including garden spigots, RV connections, faucets, hose bibs, and hydrants. The listing describes the fittings as lead-free brass with 3/4-inch threads intended to fit most standard American hoses. It includes a breakaway set screw for permanent attachment and a headless hex screw for removable installation.
Maximum listed operating pressure is 125 psi, and maximum temperature is 180°F. A drain hole releases remaining water, but the listing cautions that water may spray when the supply is turned off. Choose this set for multiple hose connections; avoid assuming the stated 3/4-inch hose sizing will fit a differently threaded faucet.
Buying Guide: How to Choose a Water Back Pressure Valve
Do you need a hose-bibb vacuum breaker or a double-check assembly?
For an outdoor faucet or garden hose, a hose-bibb vacuum breaker is the relevant style among these options. These fittings are described as preventing back-siphonage into the water supply. If your application specifically requires protection against backpressure as well, the 1-350 listing explicitly describes a double-check assembly for backpressure and back-siphonage. Confirm the required device type for your plumbing application before buying.
Which thread size should you check?
Compare the faucet and accessory threads before ordering. Several products list 3/4-inch hose-thread connections, while the PK1390 has a 1-1/16-inch fine-thread female inlet and a 3/4-inch GHT outlet. Do not choose based on the outlet alone: the inlet must also match the faucet or existing fitting.
Does self-draining matter?
A self-draining design may be useful if you want water to drain when the faucet is shut off. The Eastman and PK1390 listings describe self-draining features; other hose-bibb options list a drain hole. Because draining can produce a spray, follow the product’s caution and keep clear when shutting off the water.
Should you choose one fitting or a multipack?
Choose a single fitting when replacing one valve or matching a particular connection. A two-pack or three-pack may suit multiple outdoor outlets. Check what is included: the first product lists washers and thread tape, while SUNROAD lists two screw options for installation preferences.
What pressure and temperature limits should you compare?
For the products that state limits, compare them with your application: the listed maximums are 125 psi and 180°F. These figures are product limits, not a guarantee that a fitting is suitable for every plumbing system. The Eastman and double-check assembly details provided here do not state those limits.
Frequently Asked Questions
Is a backflow preventer the same as a back pressure valve?
Not necessarily. A vacuum breaker is intended to prevent back-siphonage, while a double-check assembly may be specified for backpressure and back-siphonage. Select the device based on the hazard and plumbing requirements.
Can a hose-bibb vacuum breaker fit any outdoor faucet?
No. Check the inlet and outlet thread types and measurements. A 3/4-inch hose-thread fitting will not necessarily match a faucet with a different connection.
Why does water spray when I turn off the faucet?
Some listed vacuum breakers drain remaining water through a hole. The SUNROAD and PK1390 listings caution that spray can occur during shutoff, so stand clear.
What does a break-off screw do?
A break-off screw is intended to secure a fitting permanently. Some products also offer a removable screw option; check the specific product details if removability matters.
Which listed option specifically addresses backpressure?
The 1-350 Double Check Backflow Preventer listing states that it is designed to prevent both backpressure backflow and back-siphonage. Verify its connection requirements and suitability for your system before installation.