This SMC KRT11-00 union tee tube fitting joins three 3/8" OD soft nylon tubes at 90-degree angles, with a collet and chuck mechanism to securely hold the tubing. The polybutylene terephthalate (PBT) fitting is flame-resistant to Underwriters Laboratories (UL) 94 V-0 standard. It resists corrosion and has an operating temperature range of -5 to +60 degrees C and a maximum operating pressure of 145 pounds per square inch (psi). This KR series union tee tube fitting resists damage from weld splatter and is suitable for use with air and water in low-vacuum and in pressure applications, such as in metal fabrication.Tube fittings are components used for connecting, branching, terminating, and changing the direction of tubing in pneumatic and hydraulic systems. They are made of brass, stainless steel, polybutylene terephthalate (PBT), and other materials that resist corrosion and wear. Tube fittings have various types of connections, including threaded, welded, barbed, and push-to-connect (also called one-touch). Push-to-connect connections do not require tools or sealants. Tube fittings are used in various applications, including machine tools, airplane and truck controls, and automated production lines, among others.SMC Corporation manufactures actuators, valves, airline equipment, connector fittings, electrical products, vacuum products, dryers, temperature control chillers, and accessories. SMC Corporation of America is headquartered in Noblesville, IN, and meets International Organization for Standardization (ISO) standards 9000:2000 and 9001:2008.