What is it? Our quick connectors are made of Polypropylene,It adopts Push to connect technology, which allows users to connect and disconnect quick and easy without the need of any other tools. Ball valve gives full flow and positive shut off without leakage. Valve act is 90 degrees, full on to full off, with no seepage.It fits standard 3/8 inch OD plastic RO tubing, Copper, CPVC, PEX and PVC pipe or hose. Where to use it? Applications include RODI system,Irrigation System, refrigerator ice maker tubing, coffee machine etc. This quick connect fitting is are perfect for hooking up a kitchen water supply , it isolate water line without shutting off all the cold water to the kitchen. It will save you lots of work getting to replace your in-line water filter without having to turn the water off in the basement or under the sink.You can also use it to run the RO System to the fridge ice maker. How to use it? 1. Quick connector can be connected without tools; 2. Just put in your 3/8 inch OD tubing into either end, insert the tube into the bottom; 3. Before removing the pipeline, pull it out by pressing the piston, and then pull it out. What you will receive? 3/8 inch Ball Valve x10