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Thread: Compression fittings and brass pipe

  1. #1
    DIY Junior Member Gravity's Avatar
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    Default Compression fittings and brass pipe

    Hi, I was going to install shutoff valves on existing 1/2" brass cold and hot water lines. Can I use valves with 1/2" compression inlets? Do they play nice with brass pipe? Or should I use 1/2" sweat connection?

    If I sweat it, is there any need to modify my copper pipe soldering technique for brass pipe?

    Thanks!

    And before anyone mentions it, I know PEX is awesome and the greatest thing since sliced bread, blah blah blah but it isn't in the budget for this renno.

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    Forum Admin, Expert Plumber Terry's Avatar
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    A threaded brass nipple needs threaded stops.
    1/2" copper can use either sweat on stops, or compression.

    1/2" copper is 5/8" OD

    Last edited by Terry; 02-22-2014 at 10:02 AM.

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    DIY Junior Member Gravity's Avatar
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    Thanks for the response, Terry.

    As a hypothetical, what if I cut back existing brass pipe with a sawsall and there was no threaded end left? Could you use compression on that?

    Thanks again.

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    Forum Admin, Expert Plumber Terry's Avatar
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    Quote Originally Posted by Gravity View Post
    Thanks for the response, Terry.

    As a hypothetical, what if I cut back existing brass pipe with a sawsall and there was no threaded end left? Could you use compression on that?

    Thanks again.
    I would not do that.
    I'm not aware of a compression fitting for those. There are plenty of stops that thread on though.
    It's an easy job to spin on a new stop.

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    DIY Junior Member Gravity's Avatar
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    Excellent, thank you Terry!

    Best,
    Mike

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    Moderator & Master Plumber hj's Avatar
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    There are no "compression", or solder, fittings for brass pipe. They are threaded and screwed. What are you trying to do? How about a picture, in case you are describing the task improperly?
    Licensed residential and commercial plumber

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    DIY Senior Member dj2's Avatar
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    I suspect that the OP cut off the thread on the brass nipple.

    If that's the case, unscrew the brass nipple and replace it with a new one.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    If thatis case, then it was a "do something even if it is wrong" action/reaction.
    Licensed residential and commercial plumber

  9. #9
    DIY Junior Member Gravity's Avatar
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    Thanks guys. I'll just spin on a new top as Terry suggested.

    I am actually just in the planning stages of a small kitchen renno and the 1/2" cold and hot water pipe under the sink is brass so I was just wondering if I could just cut the pipe back with a Sawsall and get new shutoffs with 1/2" compression fitting connections to be used on the brass pipe. I know enough about plumbing to be dangerous but everything in my house is so different from modern construction standards that I always make sure I come here before putting saw to pipe!

  10. #10
    Retired Defense Industry Engineer jadnashua's Avatar
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    What is the OD of the brass pipe? The stuff is pretty stiff, so a compression fitting probably wouldn't seal, even if the size was okay.

    FWIW, in MA, doing ANY plumbing without a license and a building permit can get you into hot water, so beware.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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