Knock on couplings

Discussion in 'Irrigation' started by muddywater, Sep 21, 2012.

  1. muddywater

    muddywater LawnSite Bronze Member
    Messages: 1,813

    Anybody using these for 2" pipe? I am leaning toward trying more of these on 2" maybe even 1 1/2" pipe. I just don't feel good about telescoping couplings on these. I guess the only downside is we would have to keep a tool on the truck to bevel the edges.
  2. Irrigation Contractor

    Irrigation Contractor LawnSite Senior Member
    Messages: 424

    I have banned my guys from using them on mainline period! LOL

    1" to 2" can be used for laterals, but in the end our rule is to do it right with all new fittings if possible.
  3. mitchgo

    mitchgo LawnSite Silver Member
    Messages: 2,957

    I don't know this term tho i've probably seen it. Link?
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,764

    we don't need no steenking link


    Uploaded with
  5. ArTurf

    ArTurf LawnSite Platinum Member
    Male, from Ark
    Messages: 4,473

    I used them on a main line at a golf course one time. As far as I know they held up, I haven't been back there in a while.
  6. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Messages: 6,202

    I've put those on a main line in Hollistan, MA @ some shotty Builder site..

    Nothing like dripping 100+ declining trees off a rotor zone..

  7. agrostis

    agrostis LawnSite Silver Member
    Messages: 2,545

    I think those fitting's are junk. Steel only. The problem is you can't get ductile iron fitting's smaller than 2 1/2 inch's.
  8. muddywater

    muddywater LawnSite Bronze Member
    Messages: 1,813

    Why are they junk? A couple local golf superintendents swear by them.
  9. HokieAg07

    HokieAg07 LawnSite Senior Member
    Messages: 357

    Harco Knock Ons are all I use on 2 1/2" and larger. Easy as pie.
  10. agrostis

    agrostis LawnSite Silver Member
    Messages: 2,545

    Unless you have a perfectly straight run of pipe that never move's, those thing's will split along their construction seam. I try to use ductile iron only.

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