HiKOKI 6685135 Oil Pump Case Ass'Y for compatible Hitachi and HiKOKI petrol chainsaws. This replacement oil pump case assembly forms part of the chain lubrication system and is suitable for replacing a worn, damaged or faulty original component. Manufactured to the correct specifications for precise fit and reliable operation. Part 6685135 replaces previous part numbers 088-72000-90 and 6685132.