Response to Hi Richard, There have been two lids used on the Pentair Whisperflo pumps over the years and each use a different gasket. For Whisperflo pumps before November 1998 they used a stainless steel band clamp to secure the pump lid and this style lid uses The Old Whisperflo Lid O-ring. For Whisperflo pumps after November 1998 they used a plastic locking ring to secure the pump lid and this style lid uses The New Whisperflo Lid O-ring. I hope this helps!

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