1 clamp o-ring +Lube compatible for Pentair 39300600 -Multiport Valve and Filter but 10 o-rings of the

but 10 o-rings of the one size

If you have the older OB1 Whole House Filter with original color BLUE o-rings

which is the Aerospace Size Standard for O-rings

and retains its pliability even after extended service use

Includes 5 grams MCG-111

1 clamp o-ring +Lube compatible for Pentair 39300600 -Multiport Valve and Filter but 10 o-rings of the70 Shore clamp o ring replacement Fits Meteor Top Mount pool and spa sand filters Also fits pool and spa clamp on multiport valves Made of buna n material This is an aftermarket 70 shore o ring for a slightly tighter fit than the 50 shore o ring. Includes single use silicone lube for easier installation and added protection to the o ring.