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Old 10-09-2008, 09:21 AM   #1
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Installing a Compression Fitting

I'm trying to install a compression fitting for my new Pedastil sink. It is going on a copper 1/2" pipe. Last night i tried to do it and as soon as i turned the water back on the fitting blew off the line and i got water all over my just finshed renovated bathroom. So how do i install these once and for all and what do i use?


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Old 10-09-2008, 11:29 AM   #2
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Installing a Compression Fitting

I'm assuming these are compression shutoffs...

First, make sure you have the right size of fitting.

Use emery cloth to clean the copper pipe so it looks nice and fresh. Don't skip that step. Then slip the nut over the pipe, then the compression ring. Do not use any sort of sealant. Push the fitting on the pipe as far as it will go, which will seat the ring against the fitting. Thread the nut onto the fitting hand tight. Using two crescent wrenches (pliers don't work as well), hold the valve or fitting body steady with one while cranking the nut down with the other.

Normally if they leak a little, cranking the nut down harder (without allowing the fitting to turn) will take care of it.

They're hard to do wrong, which makes me think you skipped a step or you have the wrong fitting.


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Old 10-09-2008, 11:59 AM   #3
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Installing a Compression Fitting

Sounds like the compression ring wasn't put on.
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Old 10-10-2008, 01:20 AM   #4
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Installing a Compression Fitting

The brass ferule ring does the sealing, not the threads, on a compression fitting. As kctermite said, cleaning the pipe well is a must.
The only place that someone might use teflon tape, pipe compound or a smear of caulk would be on the ring itself.
Good Luck!
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