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Thread: Drain plug O ring on Pentair FNS plus

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    Drain plug O ring on Pentair FNS plus

    I have an FNS Plus (48) and need to replace the oring at the drain plug on the bottom of the filter. Its an 1.5" Oring. Two questions.
    1. If I remove the drain plug will it be necessary to replace some DE?
    2. Is that a standard replaceable part or would it be something proprietary to the filter? I don't want to take it off only to hear "I need to order that".

    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    spishex's Avatar
    Join Date
    Oct 2008
    Hillsborough, NC

    Re: Drain plug O ring on Pentair FNS plus

    Since that's just a threaded plug, you can use teflon tape or pipe dope to seal it instead of relying on the o-ring. You'll lose a bit of DE but not much.

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