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. It is used to branch off to different outlets for your RO unit.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 perfect for Tee in a water line going to your fridge or T off your water line under your sink for a filtration system as well as run two reverse osmosis faucets in back to back bathrooms from a single R/O unit. This will take the headache out of an under counter water filter installation JHow to use it? 1. The quick connector can be connected without tools. 2. Insert your 1/4 inch OD tubing into either end by putting the tube into the bottom. 3. Before removing the pipeline, remove the fixed blue card. 4. To remove the tube, press the piston and pull it out. What you will receive? 10 pieces each of 1/4 straight - through, Y - shaped, three - way and elbow connectors.