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2" (50mm) threaded heater union tail piece. Suits Gecko, Balboa, Hydroquip and many others
Aqua-Flo XP2/XP2e 50mm Pump Union and O'ring.
Davey 50mm Union
50mm Split Nut with Screws
Balboa 2" Heater Element Split Nut
Waterco Mac Half Union 40mm Black