Installing a clawfoot tub in new master bath. The supply lines to the tub use compression with a rubber gasket, washer and nut attached to shut-off unit. The cold water line has worked fine, but twice now the water pressure has pushed the line out of the shut-off unit and water has shot to the ceiling (thank goodness I was home) I'm out of ideas on how to be sure the attachment will hold. Please help!

Not sure that I completely understand the supply line you are using but I think you are saying you are using a straight piece of supply tubing inserted in the faucet valve. This is held in place with a nut over a cone shape gasket.

Either that or you are using a rubber washer under the nut where it is attached to the stop valve. That end should be attached using a nut and compression ring.

Either way,

switch over to a flexible braided faucet supply line.

It's a straight supply line double offset as its decorative... both ends were provided with a cone gasket to the faucet and the stop valve, no compression ring... that sounds like it would do the trick... one other question then, do I still need the cone gasket with the compression ring?

OK, you are using the chrome or brass hard supply tubing. The upper end should have a flange where it connects to the faucet. The lower end where it connects to the stop valve should use the compression ring and nut. The compression ring is soft brass and conforms to the mating surface of the valve to provide a water tight seal. The tubing must come straight out of the valve for about 1 inch before bending so that the compression ring fits properly.

Hi guys!

You aren't tightening the compression nut enough here, Thesnave...;) Here, install the compression nut, the washer and then the rubber cone. Use two different crescent wrenches...one crescent wrench holds the shut off valve body and the other one is used to tighten the compression nut real well!

These decorator supply tubes (see image) are made of a more rigid material than the supply tubes Harold (Hkstroud) posted and yet, they are not as thick as the older, traditional style clawfoot tub risers, but they do NOT use compression ferrules (rings). The shut off valves should be hung so they are stiff to the touch and then these supply tubes get installed and tightened as I mentioned (while simultaneously tightening the faucet connections (but do NOT overtighten these connections)). A little pipe dope or thread sealant will be helpful at the faucet connection but will NOT be helpful with the connection at the shut off valve, OK?

Try again....should be all set now!

Mark