When I received the clutch, I have used them immediately for my irrigation in the garden. It has struck me that the check valve was leaking back and front. Only after I have dismantled the valve and fittings have sealed with Teflon, the valve was then sealed. With a branded goods like Gardena, I expect a better quality goods. Since I can the next time so-called equal. "China-scrap" order and save money.