Model No. 83218;Designed for the testing of pipelines or to temporarily stop the flow;Each plug is designed for two or more pipe sizes;Plugs are suitable for many different pipe materials;Manufactured from a durable natural rubber compound;4-8" through 12-24" sizes come with a replaceable pressure relief valve;1 1/4"-2" through 3-4" sizes come with a 1/4" NPT Replaceable Inflation Valve;Contains an eyebolt for tethering;Replaceable tank valve can be changed to a quick disconnect plug for faster inflation