CHE SURE-GRIP PLUG, 4 IN. CHERNE POLYPROPYLENE MATERIAL; 3.5 INCH PLUG/BALL LENGTH; MECHANICAL OPERATION TYPE; NATURAL RUBBER O-RING INCLUSIONS/FEATURES; TEST PLUG; 30 FOOT ALLOWABLE PRESSURE HEAD; 13 PSI ALLOWABLE TEST/BACK PRESSURE; 4 INCH PLUG/BALL DIAMETER; SURE-GRIP[R] BRAND