Water Tank Cap Plug 9.6mm – Durable Leak-Proof Seal

This 9.6 mm water tank cap plug provides a reliable solution for sealing off unused outlets on your boat’s freshwater tank. By installing the cap on any open tank port, you prevent unwanted leaks during voyages and keep the tank’s contents secure from contamination and air exposure. It’s perfect for small to mid-sized boats with built-in water systems – from inflatable RIBs and fishing boats to cruising yachts – anywhere you need to temporarily or permanently block a water tank opening.

Crafted from high-quality nylon plastic, this plug is highly durable and resistant to fuel, corrosion, and UV damage. Its robust construction and leak-proof design ensure a tight, reliable seal that keeps your potable water safely contained even when the boat is in motion. This helps maintain water pressure and cleanliness, contributing to crew comfort and safety on longer journeys where fresh water is critical.

Installation is quick and straightforward – simply screw or firmly push the cap onto the 9.6 mm tank fitting, and the integrated O-ring (if present) will create an immediate seal. No tools are required to fit or remove the cap. The compact, low-profile design won’t snag and allows easy removal when you need to reconnect a hose or inspect the tank. For best results, occasionally check the sealing surface for debris and clean it to ensure optimal performance. With this universal water tank stopper in place, your tank remains dry and protected, extending the life of your plumbing and reducing maintenance needs.