Description Water Pump Pulley used in the OM603 water pump upgrade and on the OM606. The parts below are required to complete the upgrade: :Water Pump - OM606Water Drain Pipe - OM603/OM606Water Pump Housing - OM606Thermostat - OM603/OM606 - 80���������Thermostat Cap - OM606Water Pump Housing Gasket - OM606