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Tips & Techniques

Downsizing Pressure Stubs

Normal threaded pipe caps are bulky and require a large hole. Try this tip to stay on the small side.

Issue 269 - Aug/Sept 2017
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When drywalling and tiling bathrooms, I like to install temporary 1/2-in. or 3/8-in. pipe stubs in all threaded drop-ear elbows so the supply lines can be pressurized. But I find that the normal threaded pipe caps are bulky and require a large hole. To stay on the small side, I take a 4-in. black pipe nipple and weld one end closed. Then I grind it smooth. This way, I only need to make a hole a little larger than the pipe’s outside diameter. My tile guys particularly like this trick, as it can be difficult to make a hole large enough to clear a normal threaded pipe cap that will still be completely covered by the fixture escutcheon. As a note, I always use black pipe, as welding galvanized pipe will produce unhealthy fumes.

— Don Marty, Verona, Wis.

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  1. AnnsKitchenAndBath | May 20, 2019 04:44pm | #1

    I use brass nipples with a hex pipe cap. There are some hex pipe caps that are pretty small so they don't need a hole much bigger than the pipe itself. When I'm ready to install the stops, the cap comes off while the brass nipple stays in place so I don't disturb the joint inside the wall. I really like using the drop-ear connections - it makes for a very sturdy connections!

    I dislike the stubouts that are designed to use the compression fitting stops. I mistrust the compression fittings and once applied, it's impossible to change a tight fitting escutcheon.

  2. remodel53 | May 20, 2019 04:47pm | #2

    Great tip...thanks

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