Boltigen 6" Frost-Free Anti-Siphon Sillcock Faucet — Lead-Free Brass, 1/2" NPT x 3/4" GHT

Boltigen 6-inch Anti-Siphon Frost Free Sillcock is a lead-free brass, freeze-resistant outdoor faucet that prevents backflow and protects exterior plumbing in cold weather.

This frost-free sillcock by Boltigen combines a built-in anti-siphon feature with a 6-inch stem length to keep water and pipes safe from freezing and contamination. Designed with a 1/2" NPT inlet and a 3/4" GHT hose bibb outlet, the valve threads into standard plumbing and accepts common garden hoses. Its chrome-plated, lead-free brass construction resists corrosion while remaining suitable for potable water lines. The design is meant for new installations or replacing older sillcocks where freeze protection and backflow prevention matter.

How does this sillcock prevent freezing and pipe damage?

The 6-inch stem positions the shutoff point inside the warmed interior wall cavity so water drains from the exterior spout after shutoff, reducing the risk of freezing. The frost-free design keeps the water supply farther from the cold exterior, and the durable brass body maintains integrity in low temperatures. Proper installation with a slight slope toward the exterior ensures effective drainage.

• 6" stem locates shutoff valve inside wall cavity
• Drain-back design eliminates standing water in exterior spout
• Lead-free brass resists freeze-related cracking and corrosion
• Chrome plating adds extra surface protection

What does the anti-siphon feature do and why it matters?

The integrated anti-siphon mechanism prevents water from being drawn back into your home’s potable water system, reducing contamination risk. This is especially important when connecting hoses to irrigation systems, pressure washers, or filling containers outdoors. The feature meets common backflow prevention practices without adding a separate device at the outlet.

• Built-in anti-siphon prevents backflow into supply lines
• Eliminates need for additional backflow attachments in many applications
• Useful when the faucet is below any water source or submerged hose ends

Will this fit my plumbing and hose accessories?

Boltigen’s sillcock uses a 1/2" NPT male inlet, which threads easily into 1/2" threaded pipe or fittings. The outlet is a standard 3/4" GHT (garden hose thread), compatible with most garden hoses, quick-connect fittings, and watering accessories. That combination makes it straightforward to replace existing sillcocks or install on new exterior lines.

• 1/2" NPT male inlet for common threaded pipe connections
• 3/4" GHT outlet fits standard garden hoses and hose fittings
• Threaded installation keeps connections leak-resistant and serviceable

How durable is the material and what maintenance does it need?

The body is made of lead-free brass with a chrome-plated finish, offering strong resistance to corrosion and long-term wear from outdoor exposure. Brass maintains dimensional stability across seasons and the chrome surface eases cleaning. Routine winter prep—shutting off, draining, and insulating the exterior wall if exposed—is recommended for best performance.

• Lead-free brass construction for potable water safety and corrosion resistance
• Chrome plating for easier cleaning and longer finish life
• Low maintenance: shut off and drain before freezing weather for optimal protection

Who this is for: Boltigen’s 6" Anti-Siphon Frost Free Sillcock suits homeowners, contractors, and property managers who need a reliable, code-conscious outdoor faucet that prevents backflow and protects exterior piping from freezing. It’s a practical replacement for older sillcocks, a smart choice for new exterior water lines, and appropriate wherever a durable, hose-compatible, lead-free solution is required.