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Thread: Need help with part ID for Pentair FNS Plus DE Filter.

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    Need help with part ID for Pentair FNS Plus DE Filter.

    Hi All,
    I developed a leak at the main drain of my filter and am having a hard time finding the correct one online. My particular filter has a cap style drain (threads on the inside) whereas pool plaza shows the part as a plug (threads on the outside). Any ideas? Could I just use some Permatex #2 to seal it or should I get a new cap and Oring?
    Thanks,
    JOE
    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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    Join Date
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    Coastalish 'down easter'
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    Re: Need help with part ID for Pentair FNS Plus DE Filter.

    Hey Joe, good to see you

    The permatex may well work, but I'd take the cap to a good plumbing store and see if they can match it.

    Also, there should be a gasket in it to seal it, check yours out
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

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    Re: Need help with part ID for Pentair FNS Plus DE Filter.

    Thanks! Its been a while- a long winter There is an O-ring in there but it doesn't seal any longer. I tried teflon tape but it doesn't work well. I always found the permatex #2 to work much better. I just don't really want to gum up the threads but I guess it shouldn;t really matter. The #2 should clean up well with acetone I guess if I had to clean it for some reason.
    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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    Join Date
    May 2007
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    South Central NJ
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    Re: Need help with part ID for Pentair FNS Plus DE Filter.

    Clean threads are a must. Getting all the old DE and Teflon out will make life much easier.

    I use a toothbrush with the handle broken off to clean the threads before threading the drain cap. I then apply a turns of Teflon tape. The thread size is 1-1/2" NPT (National Pipe Thread). A Hayward 1022C pipe plug fits but can be a bit a PITA to get tight or loosen when used instead of the Pentair version.

    I don't recommend the use of any other sealant other than Teflon tape for this application.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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    Join Date
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    Re: Need help with part ID for Pentair FNS Plus DE Filter.

    I don't even recommend the teflon! It's the gasket, kept secure by good threads, that makes the positive seal needed on a pressurized filter, you sure as Heck don't want that puppy leaking or blowing off.
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  6. Back To Top    #6

    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: Need help with part ID for Pentair FNS Plus DE Filter.

    Gaskets often get cracked with age. Rather than strip the gasket off a 1022C pipe plug, a little teflon usually saves the day.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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