Hi,

Tried to search, but didn't see an answer:

I removed an old compression fitting from a 1/2" copper tube, and cut the tube using a tube cutter. It was a pretty old tube, so it had some crud on the outside.

I sanded it down with some 100 grain sand paper and then tried to fit it with a new compression fitting. I've tightened it down a bit, and at first look, it would seem fine.

But i've noticed a very slow leak (probably 1 drip ever 20 min. or so) from the compression nut side.

My question is, is this just a matter of cranking the nut down tighter? or is it possible that sanding with 100 grain sand paper created groves in the copper piple causing a bad seal?

What grain sandpaper is recommened for this? (if this is thought to be the issue?) 150? 200?

TIA

KeepItSimpleStupid

I'd probably use 400 grit. Here is a link for tighening compression fittings:

Connecting copper - compression joints

One full turn past finger tight when new.

ballengerb1

That was pretty coarse paper for a copper tube. I'd cut the compression ring off and replace with a new one, sand with very fine emery cloth or 000 steel wool, not 100.

cartman13

thanks guys!