What is it? Polyethylene 1/4 RO Tubing for Reverse Osmosis Systems is durable, flexible, odorless, tasteless, and non-toxic,It is pliable but not soft Compatible with RO(DI) systems that utilize 1/4 water line. The 1/4" measurement is the outside diameter of the tubing and will work with all 1/4" Push-Connect fittings. Four Length Sizes Available: Each length will be a continuous piece. If you need a single piece longer than what is listed below,Contact with us firstly; 15 Feet 30 Feet 60 Feet 100 Feet How to use it? Just connect with the push fit connectors and delivery the water to the applications you need .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 leak What you will receive? Tubing(Length you choose)