Test-Tite 83613 Single Size Pneumatic Test Plug, 3 in Pipe, 4-3/4 in L, 13 psig. New, 160 available. 3 in. Standard Pneumatic Test Plug is designed for the testing of pipelines or to temporarily stop the flow. Can be used in a variety of fitting applications and are suitable for most pipe materials. Conforms to irregular pipe shapes to seal effectively. Manufactured from a durable natural rubber Suitable for most pipe materials Metal cap/core tool is also included 3 in. Durable