Will this work with my existing fuel cell opening?

This is a universal 45-degree filler neck designed for fuel cell tanks. Verify your tank's filler opening diameter and mounting provisions before ordering — tank designs vary, and test-fitting is recommended to confirm compatibility.

Does the aluminum cap seal tight?

The cap is designed to close securely on the neck. For fuel cell applications where vapor containment matters, inspect the cap's seal surface and consider a fuel-resistant gasket or O-ring if your fuel cell demands additional sealing.

What installation hardware comes with this?

The filler neck assembly ships as pictured. You'll need to source mounting hardware (bolts, brackets, or welding) based on your fuel cell tank's design — this varies by tank manufacturer and installation method.