Ambuker RV Lockable Fresh Water Inlet — 39mm Gravity Fill Cap with Spring Seal, 2 Keys

Ambuker RV Lockable Fresh Water Inlet is a durable, food-grade plastic gravity-fill cap and hatch kit that secures your RV or camper water tank while providing fast, splash-resistant filling.

This replacement inlet kit is built for RVs, trailers and campers that need a reliable, sanitary, and easy-to-use water fill point. Crafted from food-grade PP and finished with a spring-sealed bayonet cover, the Ambuker inlet combines a lockable design with a wide 39mm opening, anti-backspray ventilation and a visible industrial-texture cap for simple integration into most RV exteriors.

How does this fill inlet prevent contamination during storage and travel?

The Ambuker inlet uses food-grade polypropylene and a locking cap to block unauthorized access and reduce the risk of foreign material entering the tank. A sealing ring and tight spring-loaded latch form a water- and dust-resistant barrier when closed.

• Injection-molded food-grade PP body for safe water contact
• Two included keys for controlled access
• Sealing ring plus spring device to prevent leaks and intrusion

Will it make filling faster and cleaner at campgrounds?

The wide 39mm diameter gravity-fill inlet and 75° nozzle angle speed up water flow and help avoid spillage. Built-in ventilation holes prevent back-splash during filling so hoses and connectors stay cleaner and safer to handle.

• 39mm large-diameter opening for quicker fill times
• 75° bayonet inlet for controlled hose alignment
• Anti-backspray vents reduce splashing and mess

How does the spring and seal-ring design improve reliability?

Ambuker’s spring mechanism holds the cap securely closed and resists loosening from vibration and travel. The integrated sealing ring creates a waterproof barrier that prevents rain or road spray from entering once the cap is shut.

• Tensioned spring keeps the cap flush and tight under motion
• Sealing ring prevents rust and water ingress after opening
• Durable components designed to withstand outdoor exposure

What does the kit include and how does it fit my RV?

The package supplies a lockable filler cap assembly with spring and sealing ring plus two keys, sized for common RV gravity-fill openings. Its neutral industrial-arc textured cap is visually compatible with many camper exteriors and marked nozzle indicators simplify installation alignment.

• Complete fill hatch with spring, sealing ring, and locking mechanism
• Two keys included for secure access control
• Designed to mate with standard 39mm gravity-fill openings and bayonet mounts

Who is this for: Ambuker’s lockable fresh water inlet is aimed at RV and trailer owners who prioritize sanitary water access, quick filling, and secure storage. It suits do-it-yourself installers, fleet managers, and anyone replacing a worn hatch or upgrading to a lockable, splash-resistant inlet on campers, motorhomes, horse trailers or service vehicles.