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Thread: connecting trap to galvanized nipples

  1. #1
    DIY Senior Member bbillcee's Avatar
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    Default connecting trap to galvanized nipples

    can u use a pvc trap and slip nut just like u would a brass tubular when connecting to a galvanized nipple?

    over the years i always find the gal rots where connecting to the brass

  2. #2
    In the Trades Tom Sawyer's Avatar
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    If the nipple is in good shape, yes. Screw a female adapter on and go from there.

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    Retired Defense Industry Engineer jadnashua's Avatar
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    Not all that looks like brass is solid brass! A solid brass piece should last when connected to galvanized, but a plated piece would quickly start to corrode. Also, keep in mind that the threaded portion of the galvanized doesn't likely have any galvanized metal on it, or if it did, it was damaged. So, bare steel will corrode more easily.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Moderator & Master Plumber hj's Avatar
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    The way you ask it, NO! You screw a Marvel connector/trap adapter/DeSanko, (whatever they call it in your area), onto the pipe and then use ITS slip nut and washer to secure the trap. You do NOT install the slip nut directly onto the pipe.

    Last edited by Terry; 02-07-2012 at 11:48 AM.

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    In the Trades ilya's Avatar
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    hj-Are there trap adaptors with female threads? I've always had to glue 'em up.
    not a licensed plumber

  6. #6
    DIY Senior Member bbillcee's Avatar
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    thanx hj, one of the nipples is 2" what is the best way to bring down to 1.5 inch? just a reducer coupling with a 1.5 nipple then the desanko? also can the desanko be used to transition to a PVC trap or just brass or both?

  7. #7
    In the Trades Tom Sawyer's Avatar
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    If you have the room yes a reducing coupling is going to be the easiest thing to find.

  8. #8
    Moderator & Master Plumber hj's Avatar
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    with the 2" nipple you could not connect the trap directly to it anyway. Yes, there are brass trap adapters with male or female threads. A 2 x 1 1/2 reducing coupling and a male trap adapter will give you the shortest connection. And the brass adapters are for use with ANY trap material, although you would normally replace the brass ring with a nylon slip joint washer.

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