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Old 08-16-2006, 07:04 PM   #1
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How to cap copper water pipe


Hello. I'm removing a double bathroom sink and replacing with a single. I cut off the drain and capped it. But how do I cap the hot and cold water pipes after I cut them off so I can sheetrock the hole? Thanks.

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Old 08-16-2006, 07:38 PM   #2
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How to cap copper water pipe


If you know how to solder, you could solder on a cap.

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Old 08-26-2006, 09:39 PM   #3
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How to cap copper water pipe


Where do the water lines come in? From your description, it sounds like they come in from the wall.

When I removed a kitchen sink last winter, I had a similar problem. Wanted to cut off the pipe and cap it above the floorboards (supply came in from below), at least until we had a plumber in to do some more extensive work. The trouble is that as long as there's water in the line near the end, you aren't going to get a good solder joint - the heat from the torch will create pressure in the pipe, and that'll leave you with a hole in the joint. It just will not seal 100%.

I tried a whole bunch of things, then finally a guy at Home Depot suggested a compression fitting. No solder required - just put the compression fitting on the pipe, then screw a plug into the threaded side of the fitting. Took about 5 minutes and solved my problem.
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Old 08-26-2006, 09:44 PM   #4
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How to cap copper water pipe


Here a a trick of the trade, water in the pipe not allowing you to solder a good joint, use a wet vac and suction out the water, then will give room in the pipe for heat to expand to, this allowing the solder to flow and not spit back out of the joint.
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Old 08-26-2006, 09:48 PM   #5
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How to cap copper water pipe


A wet/dry vac never occurred to me. I tried using a dowel to displace the water, and then tried some rubber tubing to suck the water out myself. Neither worked very well.
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Old 08-26-2006, 09:50 PM   #6
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How to cap copper water pipe


Stick around will teach you alot of tricks on here.
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Old 09-27-2008, 12:00 PM   #7
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How to cap copper water pipe


Do you think this would work on the pipes that go to my water filtration system that I want to get rid of? I'm wondering if there is more pressure in my situation that in yours- if it would blow the fitting off?
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Old 09-27-2008, 03:39 PM   #8
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How to cap copper water pipe


Residential water pressure isn't going to blow a compression fitting off. If you have copper and don't know how to solder, a compression fitting with a threaded cap installed on it is going to be the best method for a temporary cap.

If it is a permanent cap, I'd learn to solder. It isn't hard to do, and you don't need more than about $30 in equipment to do it. If so, start a new thread and we can walk you through it.

This thread is two years old.
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Old 09-27-2008, 03:44 PM   #9
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How to cap copper water pipe


Brass compression fittings are pretty reliable at high pressure, I've used them extensively on air compressors at pressures up to 175 PSI, and pretty high temperatures. They work with copper or aluminum tubing.

Around here, the majority of plumbers use angle stops (the shutoff valves under your sink) that are compression connected to the 1/2" copper pipe sticking out of the wall.

I've done the compression fitting with a pipe plug screwed into it for a cap as well, and had no problems.

Rob

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