Dreyoo Self-Draining Vacuum Breaker 2-Pack — 1-1/16" to 3/4" GHT Anti-Siphon, Metal, 125 PSI

The Dreyoo 2PCS Self-Draining Vacuum Breaker is a compact anti-siphon replacement that automatically drains hoses and prevents backflow by converting a 1-1/16" female inlet to a 3/4" GHT male outlet.

This pair of self-draining vacuum breakers is built for outdoor faucets, hose connections, RV spigots and other U.S.-standard fittings where preventing siphon and residual water is important. Constructed from durable metal with precision threads and internal gaskets, each unit withstands up to 125 psi and temperatures to 180°F (82°C). Note: not intended for potable water supply systems; always follow local plumbing codes when installing backflow prevention devices.

How does this vacuum breaker stop backflow and why is self-draining helpful?

The vacuum breaker uses an anti-siphon mechanism that blocks reverse flow when the upstream pressure drops. When water is shut off, the internal drainage path opens to release trapped water from the hose or spigot, reducing freeze risk and preventing stagnant water buildup.

• Anti-siphon valve prevents water from flowing back into supply lines.
• Automatic drain clears water from hoses and fittings after shutoff.
• Internal gasket and precision threads ensure a tight seal to avoid leaks.

What are the compatibility and installation details I should know?

Each unit threads onto a 1-1/16" female inlet and provides a 3/4" GHT male outlet, matching common U.S. hose and tap standards. Installation is straightforward and lightweight, designed for quick replacement without special tools; tighten securely but avoid overtightening to protect threads and gaskets.

• Inlet: 1-1/16" female thread; outlet: 3/4" GHT male thread.
• Rated to 125 psi maximum working pressure and 180°F (82°C) maximum temperature.
• Easy hand or wrench install—use plumber's tape if desired for added sealing.

What materials and durability can I expect from these replacements?

Made from high-quality metal with corrosion-resistant finishes and an internal sealing gasket, these vacuum breakers are designed for extended outdoor use. The materials resist fading, cracking, and aging, making the pair suitable for seasonal and year-round installations in exposed conditions.

• Corrosion-resistant metal body for longer service life.
• Durable internal gasket for reliable sealing under pressure.
• Lightweight and compact—easy to carry for field repairs and replacements.

Are there any limitations or safety notes to keep in mind?

These units are effective for hose-end backflow prevention but are not rated for potable water supply and should not be used where drinking water protection is required. Check local plumbing regulations and avoid use in systems that require certified backflow devices.

• Not suitable for potable water supply systems—do not use on drinking water lines.
• Verify compatibility with local codes before installing on public or regulated systems.
• Maximum working pressure: 125 psi—do not exceed this limit.

Who is this for: The Dreyoo 2PCS Self-Draining Vacuum Breaker set is ideal for homeowners, RV owners, landscapers and maintenance professionals who need a simple, reliable anti-siphon solution for outdoor taps, garden hoses, and RV hookups. It fits common U.S. fittings, is easy to carry and install, and helps reduce freeze damage and contamination risk in non-potable applications. If you need backflow prevention for drinking water lines or a code-certified assembly, consult a plumbing professional for the correct certified device.