G-Sunny All-Metal RV City Water Inlet with Check Valve — Stainless Steel, 3/4" GHT to 1/2" NPT, Metal Dust Cap

The G-Sunny All Metal RV City Water Inlet is a stainless-steel replacement water fill and connection for RVs, campers, motorhomes, trailers and marine craft that includes a built-in check valve and a metal dust cap for durable, hygienic city-water hookups.

If you need a rugged, long-lasting inlet for shore power-style water connections, this G-Sunny city water inlet replaces worn or plastic fittings with a corrosion-resistant stainless-steel assembly. It accepts standard 3/4" GHT hoses on the outside and provides a 1/2" NPT internal connection for plumbing, making it compatible with most RV and marine systems. The integrated check valve prevents backflow and the included metal dust cap keeps debris out when not in use. The unit is patent-protected in the U.S., engineered for straightforward installation and long service life.

What makes this inlet different from plastic or low-grade fittings?

The G-Sunny inlet is constructed entirely from stainless steel, so it resists dents, corrosion and UV degradation that commonly shorten the life of plastic parts. The metal dust cap and robust flange provide a neater, longer-lasting exterior finish for your RV or boat.

• Stainless-steel body for increased durability and corrosion resistance.
• Metal dust cap prevents dirt and insects from entering the water line.
• Solid flange design for a professional-looking exterior mount.

How does the built-in check valve protect my plumbing system?

The inlet contains an integrated return/check valve that only allows water to flow inward, stopping unwanted reverse flow into the supply line. This helps protect campground lines and your vehicle’s onboard water system from contamination or pressure backfeed.

• One-way flow prevents reverse pressure and backflow into the shore source.
• Reduces risk of cross-contamination between systems.
• No separate external backflow device needed for basic protection.

What are the connection sizes and installation details I should know?

The inlet features a 3/4" GHT (garden hose thread) internal thread on the exterior side and a 1/2" NPT external thread on the interior side. The flange thread diameter measures approximately 3" for easy panel mounting. Installation is straightforward and designed to fit most RV and marine configurations with common hand tools.

• Exterior: 3/4" GHT internal thread for standard hoses.
• Interior: 1/2" NPT external thread for plumbing connections.
• Flange thread diameter ≈ 3" for compatible mounting cutouts.
• Simple install steps provided; no specialized tools required.

Will this unit stay clean and reliable during storage and travel?

The metal dust cap snaps onto the inlet to block dust, bugs and road grime when the inlet isn’t in use. The stainless-steel construction withstands vibration, salt air and temperature swings better than many alternatives, keeping seals and threads in good condition over time.

• Snap-on metal dust cap for secure storage protection.
• Stainless finish resists rust in marine and coastal environments.
• Designed to maintain thread integrity under vibration and load.

Who is this for? The G-Sunny All Metal RV City Water Inlet is aimed at RV owners, boaters and trailer users who want a dependable, long-lived water connection—especially those replacing aging plastic inlets or upgrading to a metal fitting for durability and hygiene. It’s well suited for DIY installers, mobile technicians and anyone seeking a neat, patent-backed replacement part compatible with standard 3/4" garden hoses and 1/2" plumbing connections.