XFITTING 1/2 in NPT to 3/4 in GHT Anti-Siphon Sillcock Adapter — 10-inch Single Pack, Backflow Protection

XFITTING's 10-inch anti-siphon sillcock adapter converts a 1/2" NPT inlet to a 3/4" GHT outlet while preventing backflow and reducing freeze risk at exterior faucets.

Built for outdoor hose connections, this XFITTING adapter pairs a 1/2" male NPT inlet with a 3/4" male GHT (garden hose thread) outlet and integrates an anti-siphon feature to stop contaminated water from flowing back into your plumbing. Its 10-inch length keeps the threaded connection away from walls and helps drain water out of the line, while the multi-turn operation gives precise control over flow. The single-pack design is intended for easy retrofit of sillcocks, hose bibs, and outdoor spigots where a garden-hose threaded outlet is required.

How does this adapter protect my home's water supply?

The anti-siphon design prevents water from being drawn back into household plumbing, which reduces the risk of contaminants entering the potable water line. By maintaining an air gap and a one-way flow path, it acts as a simple backflow prevention device without complex installation.

• Anti-siphon mechanism prevents reverse flow into the plumbing.
• Air-gap design reduces backflow risk during pressure changes.
• Screws onto standard 1/2" NPT inlets and provides a 3/4" GHT outlet.

Will this fit my existing outdoor faucet and garden hose?

Yes — the adapter is made to connect a 1/2" male NPT inlet common on many sillcocks to a 3/4" GHT outlet that matches standard garden hoses. Check your faucet thread size; if your sillcock uses 1/2" NPT, this adapter threads directly on and supplies a GHT-compatible spigot.

• 1/2" male NPT inlet for standard exterior faucet threads.
• 3/4" male GHT (garden hose thread) outlet fits typical hoses.
• 10-inch length provides clearance from walls and fixtures.

How does the 10-inch length and multi-turn operation help in real use?

The extended 10" body positions the outlet away from the building, which makes attaching hoses and watering tools easier and helps water drain away from the structure. Multi-turn operation lets you fine-tune flow and fully shut off water without rapid on/off movements, improving control for tasks like filling tanks or gentle watering.

• 10" length offers better access and keeps threads clear of walls.
• Multi-turn valve gives precise flow control and reliable shutoff.
• Durable construction designed for outdoor exposure and repeated use.

Who is this for? Homeowners, gardeners, landscapers, and property managers who need a reliable outdoor faucet adapter that converts 1/2" NPT to 3/4" GHT while providing anti-siphon protection will benefit from this XFITTING sillcock. It’s suited to retrofit projects, seasonal hose connections, and any situation where a garden-hose thread and backflow prevention are desired. If you want clearer access to a hose outlet, improved control over flow, and a simple mechanical anti-siphon solution, this adapter is a practical, easy-to-install option.

Key features:

• Anti-siphon design to protect the outside faucet from backflow.
• 3/4" GHT male garden hose threaded outlet for standard hoses.
• 1/2" male NPT inlet for common sillcock connections.
• Multi-turn operation for precise flow control.
• 10" overall length to increase clearance and aid drainage.