Our John Guest 3/8" QC X 1/4" QC Elbow Quick Connect uses the push-fit technology, that makes installing these parts quick and easy. The only thing you need to do for installation is push the tubing into the elbow and the quick connect fitting clamps down, making a secure fit. It's simple disconnect the tubing as well as connecting it. These plastic parts are food grade quality and these can be used with water and reverse osmosis applications only. Do not use with gas, compressed air, or vacuum applications.