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Thread: Nautilus Pac-Fab NS-72 or NSP-72 DE Filter - Parts

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    Strop's Avatar
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    Nautilus Pac-Fab NS-72 or NSP-72 DE Filter - Parts

    Can anyone tell me the O-ring sizes (not the manufacturer part numbers) for a Nautilus (Pac-Fab) NS-72 or NSP-72 DE Filter and Back-Wash Valve? I have either the NS-72 or NSP-72. The nameplate decal is faded so much I cannot tell if its an NS-72 or NSP-72. I'm curious what the difference is between an NS-72 and a NSP-72 DE filter if anyone knows?

    The O-rings I'd like to replace are the following:

    1/. Tank O-ring. This is the large (roughly 18") O-ring that seals the tank.
    2/. Manifold O-ring. This seals the manifold to the stem pipe inside the filter.
    3/. Back-Wash Valve Cap O-ring. This seals the back-wash valve cap in the main housing. The cap is secured with 2 screws. I believe this is the old style (original) back-wash valve.
    4/. Back-Wash Valve Shaft O-ring. This seals between the back-wash valve shaft and the cap. The shaft is 3/8" in dia. I think.

    Thanks!
    17.5K gallon in-ground pool, plaster/marcite, Hayward SP3400VSP Pump, Nautilus 72 sq. ft. DE Filter, Pentair MasterTemp 400 Heater, Navigator Pro Cleaner.

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    Re: Nautilus Pac-Fab NS-72 or NSP-72 DE Filter - Parts

    Why not just use the part numbers?

    I don't think that anyone is going to have the actual dimensions of the O-rings.
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    Re: Nautilus Pac-Fab NS-72 or NSP-72 DE Filter - Parts

    Quote Originally Posted by JamesW View Post
    Why not just use the part numbers?

    I don't think that anyone is going to have the actual dimensions of the O-rings.
    Unfortunately the local pool supply store (think national chain) does not have any of the o-rings in stock. I came up against this issue a few years ago when I did a filter clean and o-ring replacement. I think the local pool supply store only had 1 in stock so I had to reuse all the other o-rings and wait until the next filter clean. This time around none were available which got me thinking if I knew the o-rings sizes then I could source them from McMaster-Carr or a similar specialty hardware supplier. Plus, the pool supply store charges a premium for these o-rings. Why pay 10x the price.
    17.5K gallon in-ground pool, plaster/marcite, Hayward SP3400VSP Pump, Nautilus 72 sq. ft. DE Filter, Pentair MasterTemp 400 Heater, Navigator Pro Cleaner.

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    Re: Nautilus Pac-Fab NS-72 or NSP-72 DE Filter - Parts

    The parts should be available online.
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    Trouble Free Pool is a free resource. The people who answer questions are volunteers. If you find the site to be a good resource, please consider making a donation to help support the site. Thanks.

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