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Thread: Need a cap for 4" inlet flange

  1. #1
    Join Date
    Mar 2014
    Location
    Los Angeles
    Posts
    546

    Need a cap for 4" inlet flange

    I need a cap for a plastic nominal 4" inlet flange. The OD is about 3 15/16".

    It's for part of my dust collection system. I bought it online, and the site does not link to any end caps.

    Screen Shot 2019-06-18 at 7.28.15 AM.jpg

    I presumed a flexible end cap for a sewer clean out, the ones with the hose clamp, would fit, but they are sized about 4 1/4" ID.

    I've searched McMaster-Carr and found something that might work, but I figured someone here might have a better idea.

    thanks, Mark
    Last edited by Mark Gibney; 06-18-2019 at 11:05 AM.

  2. #2
    Cut a short length of 4" pvc, slip it over the flange, and then use the rubber cap you bought. If the plastic spacer is too loose, cut a kerf in it to allow the cap to compress it a bit.

  3. #3
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
    Posts
    2,753
    Those Fernco fitting come in multiple 4" sizes. They make them for pvc, clay pipe, cast iron, steel, and copper. You may have to buy a coupling and make a wood plug for one end.
    Bill D.

  4. #4
    You might find a plumbing cap at Home Depot. There are solid ABS caps and rubber caps that might fit.

  5. #5
    Join Date
    Mar 2014
    Location
    Los Angeles
    Posts
    546
    Paul - sounds like a plan. I'll do it tomorrow.
    Bill - I checked through a lot of Fernco end caps, couldn't find one to fit.
    Keith - none of the caps at the Big Box stores fit, strangely enough.

    Thank you all for your advice, Mark

  6. #6
    Join Date
    Sep 2009
    Location
    Medina Ohio
    Posts
    3,701
    What about a plumbing test plug

  7. #7
    How about a 4" drain-pipe cap shimmed with masking tape?

  8. #8
    Join Date
    Sep 2016
    Location
    Modesto, CA, USA
    Posts
    2,753
    Check at the grocery store. the tall pineapple juice cans fit inside dust hose. You might use a can outside the fitting or use one inside with a flat board screwed onto one end as a cap.
    Bill D.

    https://www.sizes.com/home/cans.htm

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