Pipe Fitting, PEX Barb Swivel Elbow, 3/8 x 1/2-In.

(I am very experienced.) I have installed 4 of these. They all dripped unless I secured the tubing completely perpendicular to the 1/2" male NPT piece to which I was connecting. This worked for two of them for the two that I used on a small hot water heater. The other two I used on a Delta shower valve to connect the hot and cold supply to the horizontal 1/2" brass NPT connections. I secured them to vertical studs a couple feet away to get that straight shot, and tightened the heck out of them to stop the remnant drip. That was in a rental house and thank goodness there was closet access, and I had not buried the fitting in a wall. A year or so later I get a call from the tenant that the plaster ceiling below was dripping and starting to crumble on the floor. I checked the pipe below the fitting and wrapped my hand around it. It took a minute for a drop to form, but that's what did it. -- By experimenting I realized that with just slight side pressure on the pipe, even the tightest of these fitting drip. And, like one of the reviewers said, the plastic nut broke. I wouldn't buy anything like this until it is redesigned, and has a brass nut that will handle tightening. BTW, I left the two on the water heater because it's at my house where I see it everyday, and it is over dirt--in case it drips. Caveat--I installed these in spring, 2016; if the problem has been solved, please let me know.

We used these fittings at work. Have had numerous leaks. And if we tighten them to stop the leaking, the conical gasket rips. It is NOT a replaceable part per the manufacturer. So we end up having to replace the entire part. We will never use these again. So far, we've had at least 6 of them go bad. Company should sell a pack of replacement gaskets. :(