Response to The correct replacement gasket between the valve and the tank is O-ring, Id 6-3/4", Od 7-1/8" - 364. If you were referring to the SPIDER gasket that is inside the multiport valve and your valve model is SP0714T, then the correct replacement part is Key/seal Assembly (Diffuser w/ Gasket Glued In). The spider gasket comes glued in this diffuser.

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