"I brought 2 of these. both were okay initially and then as I went to lag the pipes I moved the connection slightly and one of them began leaking. The body of the fitting appears to have a plastic/nylon liner with a brass section inside that, which in turn houses the grip ring. the leak was coming from around the plastic section and the outer body. the plastic section seemed loose in both fittings. I use Cuprofit quite a bit and have had no problems with them,but I would urge you to use Tectite if you want this type of reducer, as they dont employ the plastic part inside the body."