King Nipples called Combination Nipples, it's recommended for low pressure discharge and suction service for compatible liquids. Not for compressible products such as Air and Nitrogen.It's cutted by pipes and make different sizes.King nipple one side with male threads and and connect with pipe system, another side raised by machine, so that can connect with plastic hose. Hose mender raised both side so that can connect with plastic hose. Material: Carbon steel Surface: Electric galvanized Standard: BS, ANSI, or as demand Size: From 18" to 6" Application: RubberPlastic hose connection for waters, gas, oil, etc.