Product Description The compressor gently compresses the piston rings into position reducing the risk of damage to components during installation Key operated with ratchet mechanism and safety valve for combining safe rapid compression with positive control Made from tempered spring steel complete with steel key PRC540 For passenger car vehicle engines Capacity 57 125mm 2 14 5 Height 80mm 3 14 PRC730 For carlight commercial vehicle engines Capacity 90 175mm 3 12 7 Height 100mm 4 PRC765 For heavy commercial vehicle engines Capacity 90 175mm 3 12 7 Height 165mm 6 12