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plumbing question US 3/4" fitting to Irish

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  • 17-10-2008 12:01pm
    #1
    Darth Maul
    Closed Accounts Posts: 336 ✭✭


    Hi,
    I bought a water filter for my well on the internet from the US,
    I comes with 2 male 3/4" fittings but the thread is too narrow to take the 3/4" fittings we have here, I need to join it in to a 3/4" heavy duty pipe taking the water into the house, what fittings do I need to connect this and where would I get them.

    Cheers.


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    #2
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    You'll need to get a pair of 3/4" 311's .

    They're a male screw in thread on one end and a olive and nut on the other.


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    #3
    Micky Dolenz
    Registered Users Posts: 44,080 ✭✭✭✭Micky Dolenz


    is your 3/4 pipe black plastic? and is it really half inch heavy gauge?

    If the filter has 3/4" male thread you will need 3/4" 312 which is a female threaded connection on one side and a 3/4" nut and ring on the other. If your pipe is 1/2" heavy gauge it will fit in the 3/4" nut and ring as heavy gauge has a thick wall. However if your pipe is 3/4" heavy gauge, you will need a 3/4" x 1" 312. 3/4" female thread with an 1" nut and ring. The 3/4" HG pipe will fit in the inch side of fitting. The size of the pipe should be marked on it.


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    #4
    JamesM
    Registered Users Posts: 1,775 ✭✭✭JamesM


    Maybe I'm wrong, but I think that Darth is saying that the 3/4" 312 does not screw over the US fitting, because the threads do not match.
    Jim.


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    #5
    311
    Closed Accounts Posts: 5,332 ✭✭✭311


    JamesM wrote: »
    Maybe I'm wrong, but I think that Darth is saying that the 3/4" 312 does not screw over the US fitting, because the threads do not match.
    Jim.

    Sorry ,I misread what darth said. I presumed he had fittings that sounded like 311's.

    It sounds like the thread is the same size as a washing machine valve.


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    #6
    Micky Dolenz
    Registered Users Posts: 44,080 ✭✭✭✭Micky Dolenz


    JamesM wrote: »
    Maybe I'm wrong, but I think that Darth is saying that the 3/4" 312 does not screw over the US fitting, because the threads do not match.
    Jim.


    I say your spot on. We use a BSP thread here and the states uses NPT thread. The best place to get a converting fitting is a hydraulic and/or air product supplier. Don't think a plumbing supplier would carry such an item.


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