This cap has secure sealing and easy finger tip operation. Manufactured from the highest quality modern engineering plastics with Viton
o-ring seals (which can be easily replaced if you should ever need to do so).
The mounting ring is anodized aluminum with the flange recessed to give a perfect flush fit whether it is riveted under a metal skin, as in the RV series, or built into a composite structure. This cap is non vented and recommended to keep the fuel in, the water out and in the locking version, other unwanted items out of your tank.