WHK 3/4" GHT Hose Bib Vacuum Breaker 6-Pack — Solid Brass, Self-Draining Backflow Preventer

WHK 3/4" GHT Hose Bib Backflow Preventer Vacuum Breaker is a heavy-duty brass device that prevents contaminated water from siphoning back into potable lines and self-drains to reduce freeze risk.

This compact vacuum breaker installs on standard 3/4-inch hose threads to protect outdoor faucets, RV water inlets, sillcocks and garden hose connections. Made from solid brass with corrosion-resistant finishes, it meets ASSE 1011 / CSA B64.2 and ANSI/NSF 61-9 standards for backflow devices. Each kit includes six vacuum breakers, extra washers and thread tape so you can outfit multiple fixtures right away.

How does this vacuum breaker stop backflow and siphoning?

The unit uses a spring-loaded internal valve that closes when backflow or negative pressure is detected, stopping non-potable water from being drawn back into the supply. When normal forward flow resumes, the valve reopens automatically. Its self-draining design also prevents standing water in the fitting.

• Spring-operated check valve blocks reverse flow instantly
• Self-draining port expels trapped water when faucet is off
• Break-off screw option for permanent tamper-resistant installation

Will this fit my hose, faucet, or RV connection?

The WHK vacuum breaker has a 3/4-inch female hose-thread inlet and a 3/4-inch male hose-thread outlet, matching the common garden hose standard. It connects directly to hose bibs, sillcocks, wall faucets, most hose end valves and RV water lines without adapters.

• 3/4" GHT inlet and outlet for standard garden hoses
• Compatible with sillcocks, wall faucets, RV connections and hose ends
• Compact profile fits tight outdoor faucet locations

What are the durability and performance specifications?

Constructed from 100% solid heavy-duty brass, the device resists corrosion and handles typical outdoor conditions. It's rated for up to 125 psi working pressure and temperatures up to 180°F (82°C), suitable for residential and many commercial applications.

• Solid brass body for long-term durability and temperature stability
• Maximum working pressure: 125 psi; maximum temperature: 180°F / 82°C
• Manufactured to meet ASSE 1011/CSA B64.2 and ANSI/NSF 61-9 standards

What comes in the package and how is it installed?

The package supplies six vacuum breakers with six extra washers and one roll of PTFE thread tape, so you can install multiple units quickly. Installation is straightforward: hand-tighten to the faucet or hose thread, add thread tape for a leak-free seal, and optionally break off the tamper screw for permanent attachment.

• Includes: 6 vacuum breakers, 6 additional washers, 1 roll of tape
• Hand-tighten to 3/4" GHT, use tape for improved sealing
• Optional break-off screw converts to permanent, tamper-resistant install

Who is this for? Homeowners, landlords, RV owners, property managers and light-commercial operators who want a reliable, code-friendly way to protect potable water supplies from outdoor hoses and seasonal connections. If you need a durable, easy-to-install backflow prevention solution that fits standard 3/4" garden hose threads and comes ready in a multi-pack, the WHK vacuum breaker is designed for those needs without specialized tools or fittings.