The HoldRite stub out clamp is ideal for 1/2-in copper tube size PEX to copper transition at lavatory/sink or toilet. The clamp is compatible with copper, PEX and CPVC and easily tightens by hand, requiring no tools. Holdrite® LOCK-n-LOAD™ Tubing Clamp, 1/2 in CTS Tube, 25 lb, 1.91 in Outside Dia, Nylon, 2 x 1-3/4 in, -10 to 140 deg F, Domestic