Watflow 12-Inch Frost-Proof Anti-Siphon Sillcock — 1/2 NPT to 3/4 GHT, Lead-Free Brass, 120 PSI

Watflow's 12-inch anti-siphon frost sillcock is a frost-proof outdoor faucet designed to protect pipes and prevent backflow while offering easy hose connections.

This frost-free sillcock combines a long 12" travel stem, anti-siphon protection, and lead-free brass construction with a chrome finish to deliver a durable outdoor water outlet for homes, gardens, and irrigation systems. Engineered to meet ASME B16.34 and rated for up to 120 PSI, it pairs a 1/2" NPT inlet with a 3/4" GHT hose-bib outlet for common garden hoses and accessories. The design prioritizes freeze protection by keeping the valve seat inside the warmer wall cavity and incorporates anti-siphon features to help guard your potable water from contamination sources outdoors.

How does the 12-inch travel protect indoor plumbing from freezing?

The extended 12" travel pushes the valve seat well inside the heated area of the wall, minimizing the chance that water will remain in exposed pipe sections during freezing temperatures. With the service point moved inward, the risk of ice formation and resulting pipe damage is reduced. This mechanical length is a passive protection method—no electricity or insulation required.

• 12" stem distance keeps valve seat inside heated wall space
• Reduces standing water in exposed exterior piping
• Passive protection—works without power or maintenance

What anti-siphon and safety features are included?

The sillcock includes integrated anti-siphon protection to block backflow that could draw contaminants into your home's water supply. That feature is especially important when hoses are submerged in buckets, fertilizer tanks, or other potential contaminants. Combined with lead-free brass construction, it supports safer potable-water use for outdoor tasks.

• Built-in anti-siphon mechanism to prevent backflow
• Lead-free brass body for potable-water compatibility
• Chrome plating resists corrosion and eases cleaning

Is installation straightforward for typical home exterior walls?

Yes — the Watflow sillcock uses a 1/2" NPT inlet for a standard threaded connection and a 3/4" GHT outlet for common hoses, simplifying hookups. The two-port design gives installers flexibility when routing or splitting outdoor water lines. Standard plumber tools and fittings are usually sufficient for new installs or replacements of existing sillcocks.

• 1/2" NPT inlet for secure threaded connection
• 3/4" GHT hose-bibb outlet fits standard garden hoses
• Compatible with common fittings for retrofit or new work

What are the durability and performance specs I should know?

Constructed from lead-free brass with a chrome-plated finish, the valve resists corrosion and stays serviceable in outdoor environments. It’s rated to 120 PSI and built to ASME B16.34 guidelines, offering assurance for residential water systems. The two-port configuration and robust materials provide reliable seasonal performance when installed correctly.

• Lead-free brass body with chrome plating for longevity
• 120 PSI maximum working pressure, ASME B16.34 compliant
• Two-port design for versatile outdoor water distribution

Who is this for: Homeowners, contractors, and landscape professionals who need a dependable frost-proof outdoor faucet for cold climates and portable-water protection. It suits anyone replacing an old sillcock, installing new exterior plumbing, or adding a durable hose connection for irrigation, car washing, or outdoor cleaning. If you want a robust, code-conscious outdoor spigot that balances freeze protection, anti-siphon safety, and easy hose compatibility, the Watflow 12" anti-siphon frost sillcock is built for those tasks.