[Features] · A threaded-type pipe fitting which can securely seal tubes using the plastic sleeve. · Easy connections. · The product consists of three parts including the main body, sleeve and nut. It can be easily attached by inserting the tube into the sleeve and tightening the nut. · Available in a wide variety of diameters. · A large selection of models is available to fit tube diameters ranging from R1/8 to R1/2.