All parts are included in the Lifeguard bulkhead kits. No costly extra fittings to buy or not have on hand when needed. Safer: Lifeguard heavy wall bulkheads are constructed of the highest impact resistant pvc. It eliminates the possibility of finding hidden cracks when filling the aquarium. Versatile: Lifeguard bulkhead fittings are designed so the suction screen just presses into place. Requires 1 1.2" hole.