This is the Pentair Purex Tropic Isle and MiniMax Tube Gasket.
It fits various heaters such as Tropic Isle, MiniMax CH, NT STD with 6800, NT STD with DDTC, NT LN with 6800, NT LN with DDTC, TSI with 6800, TSI with DDTC, Plus, 75 and 100 and Original MiniMax and PowerMax Heaters.
