Home Products ENGINE SERIES KT-316 PISTON RING COMPRESSOR 4"x175mm KT-316 KT-316 PISTON RING COMPRESSOR 4"x175mm PISTON RING COMPRESSOR 4"x175mm Self locking ratchet pawl prevents premature release and allows positive locking action. 4" height, capacity 3-1/2" to 7" (90-175mm) 1673811