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Thread: How I fixed a crack in my multiport valve

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    gtemkin's Avatar
    Join Date
    Jun 2008
    Seattle, WA

    How I fixed a crack in my multiport valve

    My old multiport valve was hard plumbed to my filter. When I replaced my laterals I thought I'd convert to a union style mount for easy future disassembly. Someone had goobered one of the threaded connections to the valve with silicone, so in hindsight I should have suspected what I was soon to discover. After re-plumbing everything I had an every 5 second drip from one of the valve connections despite multiple attempts at tightening it. Took it all apart and sure enough, found a hairline crack through the threads and into the valve body. See the photos.

    Read up on the details of solvent welding and learned that the purple primer is composed mainly of solvents which are intended to initiate softening and swelling of PVC. Knowing how thin that stuff can be when fresh, I reasoned it might wick into the crack, so I lavishly wiped primer on the crack and all through the threaded area. I then dabbed regular clear solvent weld on the external crack only and left the threads in primer. I reassembled with a schedule 80 PVC close nipple that I also wiped with primer and a week later I still haven't seen any leak.

    I probably just got totally lucky and it's hard to say if this will last, but if it does last, it saved me much unnecessary expense.

    21K gal 16' x 40' in-ground pool built 1959, old school with Jacuzzi bronze pump, American Products 24" Sand Filter & Americana Multiport valve, Jandy Lite2 millivolt heater, Coverstar cover, and classic Kreepy Krauly.

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    In the Industry

    Join Date
    Apr 2012

    Re: How I fixed a crack in my multiport valve

    Nice...I hope it holds for you.

    I like seeing things like this...

    It makes me feel "dangerous" when I see a new idea!
    Science and Math Teacher
    Owner - SPS - part time pool biz
    18x36 IG Vinyl, 23000 Gallons with Jacuzzi (the bane of my existance) pumpworks
    Polaris 280 w/ PB4 booster

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