We use robust bulkhead fittings on our tanks. These are the same ones we use on our tanks. This item includes 2 replacement bulkhead fittings. The post-half (with the thick rubber gasket on it) is fed through the inside the tank and through one of the 1.5 inch holes drilled in the tank. The nut-half (with the hard plastic gasket under it) is them threaded and tightened onto the post-half for a strong, waterproof seal.
- Hard, sturdy plastic
- 3/4 inch female pipe threads on inside
- 1.5 inch male threads on outside (the hole these are mounted in is 1.5 inches)