All aluminum drain port - will never crack or decay, and lasts forever! A number of J/22’s have actually sunk while on the mooring, because their drain ports cracked and broke apart from time and UV damage. The “Drainiac” never will. Comes with plastic drain tube to attach to the cockpit drain side and the transom port, and two stainless pipe clamps. Mount with 5200 in the transom, and then cut the plastic tube to length, and seal with the Stainless Hose clamps. You will never replace them again!