Grundig RV City Water Fill Inlet with 3" Flange & Check Valve - 1" / 3/4" Threaded Fresh Water Fill for Motorhome, Travel Trailer & Camper

I. Product Overview

A cracked, leaking, or stripped city water fill turns every fill-up into a mess — water down the side of your rig, a soaked storage bay, and a fresh water tank that never quite fills. This 3" city water fill inlet replaces that worn-out fill port with a clean, secure connection: 1" threaded pipe on the outside, 3/4" threaded pipe on the inside.

With a weather-resistant body and a built-in check valve, it is a dependable alternative to a brass city water fill — and it installs in minutes with a twist-on spiral pipe design.

II. Product Features

• Built-In Check Valve: Stops water from backflowing out of the inlet, protecting your fresh water system and keeping the connection sealed in both directions.
• Leak-Proof Sealing: A tight, well-seated flange keeps water out of your walls and storage compartments instead of running down the side of your RV.
• Twist-On Installation: The spiral pipe design threads in by hand — pull the old inlet, twist the new one tight, and you are done. No special tools required.
• Weather-Resistant Body: Resists rust, corrosion, and UV exposure, so it holds up to campground sun, rain, and temperature swings season after season.
• Fits Most RV Fresh Water Setups: Works with motorhomes, travel trailers, campers, fifth wheels, and vans, and matches standard 1" and 3/4" threaded plumbing.

III. Product Specifications

• Product Type: RV City Water Fill Inlet with 3" Flange and Check Valve
• Flange Diameter: 3 in
• Outer Connection: 1" threaded pipe
• Inner Connection: 3/4" threaded pipe
• Thread Material: Plastic
• Package Dimensions: 9 x 9 x 8 cm (3.5 x 3.5 x 3.1 in)
• Item Weight: 90 g (3.2 oz)

IMPORTANT: This inlet is a connection point, not a pressure regulator. Always use a pressure regulator between the campground spigot and your RV. Please verify your flange mounting hole pattern and thread sizes before purchase.

IV. Package Includes

• 1 x RV City Water Fill Inlet with 3" Flange (check valve built in)
• 2 x Compressed Towel Sheets
• 3 x Mounting Screw

V. Precautions

• Verify Fit Before Ordering: Measure the existing flange opening and confirm your pipe sizes (1" outside, 3/4" inside) match before you buy.
• Keep the Cap On: Replace the inlet cap whenever the hose is disconnected to keep dust, insects, and road debris out of your fresh water tank.
• Hand-Tighten Only: The threads are plastic. Start the fitting by hand to avoid cross-threading, and do not over-tighten or use excessive force when installing or removing the inlet.
• Check the Hose Connection: Make sure the water hose is seated securely on the inlet to prevent leaks and to maintain steady water pressure.
• Use a Compatible Hose: Use a fresh water hose rated for drinking water. Do not use a garden hose or a hose previously used for black tank flushing.
• Inspect Regularly: Periodically check the inlet and flange for cracks, wear, or a damaged O-ring, and replace the inlet if the check valve no longer seals.
• Winterize Before Freezing: Drain and winterize the inlet before the first freeze. Trapped water will expand and crack the plastic body or check valve.