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Old 04-27-2012, 09:46 AM   #1
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Compression fitting with copper tubing for dishwasher


I am replacing my dishwasher and after several tries, continue to get small drip leaks at the 3/8" copper tubing compression fitting. Let me say I know how these fittings work and have worked with them many times. In fact I installed the previous dishwasher with the original copper line and no issues.

This new dishwasher offers little clearance underneath and not much room. I ran a new copper line and can't seem to fix the leak.

I think my issue is that the tubing is not perfectly aligned or straight in the brass fitting and therefore the ferrule is not sealing 100%. My third attempt I tightened it as tight as it could go to where it was dead end and still a small drip. With very little room to work and the copper tubing being hard to align, I am wondering if this is my problem.

Should I, or does it make sense to install the copper tubing into the fitting first while they are both outside the dishwasher and not under stress. My thought was to do this only to make sure the tubing is perfectly straight and completely inserted into the fitting to get a good ferrule crimp. Then loosen and take apart then thread the elbow into the dishwasher inlet. This way the ferrule has been crimped and I can then connect to the fitting after it has been torqued down correctly.

Would this help or be a "good practice".


If I can't get this done leak-free, I am going to look at what flexible lines are out there. It seems there are some new braided lines designed for dishwashers similar to the faucet/toilet flex lines.

Please share any comments or tricks of the trade that I am missing.

Have a good one.

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Old 04-27-2012, 10:01 AM   #2
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Compression fitting with copper tubing for dishwasher


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I think my issue is that the tubing is not perfectly aligned or straight in the brass fitting and therefore the ferrule is not sealing 100%. My third attempt I tightened it as tight as it could go to where it was dead end and still a small drip. With very little room to work and the copper tubing being hard to align, I am wondering if this is my problem.

More than likely. Hard to tell without seeing it.

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Old 04-27-2012, 10:27 AM   #3
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Compression fitting with copper tubing for dishwasher


http://www.plumbingsupply.com/braide...tml#dishwasher

The simplest, safest, fastest way would be to just replace the line like you suggested.

Lowes, and HD both have them in stock.

Always try and go with a flared fitting not a compression whenever possible, less chance for leaks.
A Shark bite fitting also would have been much easer.
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Old 04-27-2012, 03:43 PM   #4
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Compression fitting with copper tubing for dishwasher


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Please share any comments or tricks of the trade that I am missing.
Sometimes when copper goes 'out of round' on me I've used my adjustable crescent to make round it again. Never as small as 1/4" or 3/8" mind you, but it works well. Hard copper, not rolled (or soft) copper btw. Personally those braided lines are pretty easy and virtually idiot proof, no disrespect intended.

Last edited by VIPlumber; 04-27-2012 at 03:51 PM.
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Old 04-27-2012, 07:47 PM   #5
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Compression fitting with copper tubing for dishwasher


use the braided hose ...perfect for the diy....ben...
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