The John Guest Angle Stop Valve or ( Adapt-a-Valve Watts reference) connects between the supply valve and the riser, to the main water supply line, for applicationsin Reverse Osmosis, Filtration Systems, Automatic Coffee Brewers, Ice Makers and many more. The conversion adaptor can be threaded to either side of the valve to make configurations of 1/2" x 1/2" NPS or 3/8" x 3/8" Compression. Features: Incorporates integral style check valve and a 1/4 turn chrome plated ball valve Push-fit technology Quick disconnection without the need for tools EPDM 'O' rings Specifications: Lead Free - Meets AB 1953 Instructions: Shut off Water Supply at brass/chrome supply valve Disconnect riser from brass/chrome supply valve. Ensure that the sealing gasket is fully seated into the Angle Stop Valve female thread. Install Angle Stop Adapter Valve on supply line Connect The riser to the Angle Stop Adapter Valve. Fully insert tubing into the Speed Fit Side of the valve. Open Valve and check for leaks.