All Sizes Included- Included 8 kinds of Unequal diameter total 40pcs plastic Hose Barb Fittings, Hose Barb Fittings kit, Hose Barb Fittings assortment: 5pcs 1/2"x1/4", 5pcs 1/2"x3/8", 5pcs 1/2"x5/8", 5pcs 1/4"x3/8", 5pcs 1/4"x3/16", 5pcs 1/4"x5/32", 5pcs 3/8"x3/16", 5pcs 1/8"x1/4".Almost all sizes are included to accommodate different pipe diameters. Material- The barbed hose fittings are made of milky white PE (polyethylene) plastic and PP polypropylene plastic, they are durable, strong, water resistant, chemical-resistant materials to assure long life. Working Temperature & Pressure- 1. Translucent PP (polypropylene) temperature range: -22 °F to 284 °F. It is resistant to corrosion by acid, alkali, salt solution and various organic solvents below 176 °F, and can be decomposed under high temperature and oxidation. The melting point is 329 °F, and it softens at about 311 °F. 2. Milky white PE (polyethylene) temperature range: -76 °F to 197.6 °F. Melting point is 233.6°F. Easy Installation- Barb hose and barbed hose fittings for easy installation, or other tools required. Barbed ends grab the tubing tightly that won't leak; If necessary, you can use a heat gun or blower to soften the end of the tube before inserting it, after cooling, the tube will remain tight. Wide Application- Pipe connectors Suitable for applications in pharmaceutical, food and beverage, laboratory, chemical processing and others. Beautiful packaging- Straight 2way equal diameter hose connector, 18 sizes, a total of 40 pcs of Hose Barb Fittings assortments, a great value package, packed in a pp box, easy for you to access and storage Plastic Hose Barb Fitting