Special washer with a diameter of 6 mm with a rubber seal . Suitable for models of pumps Koshin 1-1,5 inches inlet / outlet SEH-25H, SEH-40H .
It is used for fastening the Flange bracket to the engine PTO flange with bolts М6х35SCMCS (Koshin ID 734532055). A set of 4 is required for one pump.