Gripper End of Pipe Plugs are designed to test drain, vent and waste systems to 17 psi backpressure (40 ft. of head pressure), meeting virtually all testing needs. The end of pipe design safeguards against the plug falling into the pipe during installation or removal. The Gripper mechanical plugs are made of rust and corrosion resistant materials, which prolong plug life. The plugs unique narrow design makes it especially useful in pipe stub outs that have limited depth. Color: Black.