Home Products ENGINE SERIES KT-317 PISTON RING COMPRESSOR 6"x175mm KT-317 KT-317 PISTON RING COMPRESSOR 6"x175mm PISTON RING COMPRESSOR 6"x175mm Self locking ratchet pawl prevents premature release and allows positive locking action. 6" height, capacity 3-1/2" to 7" (90-175mm) 1673812