Response to We have an old Jacuzzi sand filter with a Praher model TM-12 valve. There is a flange /collar that threads on to the tank that has female threads to accept the six bolt pattern of the TM-12 I assume this came with the original tank. I need a square shouldered o-ring for the TM-12 and a 6 bolt pattern flat flange gasket. The o-ring fits in a groove on the tank but does not seem to index on the valve. I found pieces of a flat gasket but have no sample to match.Leaks at this joint

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