We installed a new kitchen sink and replaced all the PVC pipe with new and also had to put in new plastic water line from the on/off valve to the new faucet. For the first couple of days it did not leak at the valve but now I it is leaking at both valves. The plastic water line has a triangle ball looking thing on the one end. Does that end go to the valve or to the faucet? If we put it on wrong would that cause the leak or is it bad valves?

When installing a plastic line onto a stop cock they often require a small brass sleeve inside the plastic pipe,recall seeing ny little left over tubes?

We didn't see anything that would have been left out. The only thing that was on the new gray water line when we bought it was a little white stopper for the brass fitting piece to go against and that was it. The only reason we bought new gray water line is that the original ones were too short so all we did is replace what was already there?

If you still have the packaging maybe we can tell what you have. If there is a nut holding the plastic tube on the stop cock try tightening it another half turn.

If we had the gray water line installed upside down with the triangle looking side the wrong way would that make it leak? Is that end suppose to be at the valve or up by the faucet?

If you installed that line upside down it would have leaked from day one. Tighten the nut, Was there a ferrule or what to make th connection to the stop?

What is a ferrule? It is attached to the valve by a brass fitting. Would pipe tape help?

No pipe tape is used with this type of pipe. Please do some homework by googling different plumbing terms. I wish I had a better library of materials to help you know the terms. This pipe is connected to the stop by either a ferrule or maybe a compression fiting but you need to see what that is in your minds eye to be able to help yourself. Here is what I got when I googled How a compression fitting works. Using compression fittings on the Natural Handyman home repair and do it yourself website

Does the water supply look like this one ? If not, let's not complicate it: go to Home Depot and get one of these in the size and length you need. Sometimes they are hand-tie supplies. No tools necessary. Takes 2 minutes to put them in with minimal chance for leaks.

Agree with milo, no need to mess with compresion type fitting any more, get one of the flex lav supplies that milo gave pics of.

I did buy those flex lines that was in the picture. The one end fit the faucet but the other end to go onto the plastic valve is too small. Is there a piece that we could put on the valve to make it fit the flex line? Or is there another solution? My father was a union plumber but he is know deceased and he is the one who did all the plumbing in the house. So if that helps explain why it was like that or how he would have done it.

Those flexible faucet lines come in different sizes. Usually 3/8 and 1/2" connections at the stop valve. Sounds like you purchased a 3/8 and need a 1/2 connection to the stop valve. Back to the store.

If that is all it is then you have made my day!! Off to the store I go! Thanks! I will let you know it that is what it is!

I may be little late with my entry, but...

HKstround is correct. The lines start at 1/4" and go all the way to 1/2" in 1/16" increaments. It may get confusing since there are couple of dozens combinations... But I am sure you can get the size you want. Let us know how you did..

We went to Menards and found what we were looking for... 1/2" & 1/2". The line is a little to long but that is all they had. It works fantastic. Thanks for all you help! You guys have been wonderful!:D

Sure, no problem. Glad to be of help...

It doesn't matter if it is too long. Just loop it to get it out of your way. For the future projects: avoid using the compression type connection. Good luck ! Milo