{"@context":"https://schema.org","@type":"Product","name":"Grundig RV City Water Fill Inlet with 3\" Flange & Check Valve - 1\" / 3/4\" Threaded Fresh Water Fill for Motorhome, Travel Trailer & Camper","description":"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.","descriptionSections":[{"heading":"I. Product Overview","text":"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."},{"heading":"II. Product Features","text":"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."},{"heading":"III. Product Specifications","text":"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."},{"heading":"IV. Package Includes","text":"1 x RV City Water Fill Inlet with 3\" Flange (check valve built in) 2 x Compressed Towel Sheets 3 x Mounting Screw"},{"heading":"V. Precautions","text":"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."}],"url":"https://grundig-auto.com/products/grundig-rv-city-water-fill-inlet-with-3-flange-check-valve-1-3-4-threaded-fresh-water-fill-for-motorhome-travel-trailer-camper","brand":{"@type":"Brand","name":"Grundig-auto"},"tags":[],"image":["https://cdn.shopify.com/s/files/1/0609/9143/8927/files/logo.webp?v=1789024092","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/d9722062f721ea3021ac4ab5ca5cf145_776dad38-ce55-4204-9517-fe6ec4b07e40.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0512.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0513.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0515.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0516.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0517.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0518.webp?v=1789023920","https://cdn.shopify.com/s/files/1/0609/9143/8927/files/IMG_0519.webp?v=1789023921"],"offers":[{"@type":"Offer","name":"Default Title","url":"https://grundig-auto.com/apps/arenza/products/grundig-rv-city-water-fill-inlet-with-3-flange-check-valve-1-3-4-threaded-fresh-water-fill-for-motorhome-travel-trailer-camper?view=shop&variant=46740682899535","price":"29.00","priceCurrency":"USD","sku":"City Water Fill Inlet-01","availableForPurchase":true,"oneTimePurchase":true,"additionalProperty":[{"@type":"PropertyValue","name":"Available to purchase","value":true},{"@type":"PropertyValue","name":"Option","value":"Default Title"}],"potentialAction":{"@type":"BuyAction","target":"https://grundig-auto.com/apps/arenza/products/grundig-rv-city-water-fill-inlet-with-3-flange-check-valve-1-3-4-threaded-fresh-water-fill-for-motorhome-travel-trailer-camper?view=buy&variant=46740682899535"}}],"variantCoverage":{"exposed":1,"total":1,"complete":true},"source":"live_public_shopify_product","illustrative":false,"updatedAt":"2026-10-09T02:25:16Z","checkedAt":"2026-10-15T05:05:54.163Z","buyingConditions":"Currency verified from the anonymous storefront. 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