Elbow is suitable for use in hot and cold water applications. It adopts push-fit technology which allows users to quick and easy connect and disconnect without the need of any other tools. Operated by hand, it replaces threaded or flanged connections which require wrenches. Applications include RO system, beverage dispensing, refrigerator ice maker, coffee machine etc. This quick connect fitting is perfect for a water line going to your fridge or your water line under your sink for a filtration system. This will take the headache out of an under counter water filter installation. How To Use? Just pop in your 3/8" tubing into one end, pushing until it won't go in. Then plug in the stem part to the place you need to connect. To remove, just push in the outer circle on each end and pull right out. You need to make sure the tubing is cut squared to ensure no leaks. Be sure you cut the tubing even and straight, without crimping it. Then insert straight, and all the way into the connector. If it's crooked, or not inserted all the way or crimped, it may be leaked.