Moin Am OM616 (“240d” diesel engine is installed between vacuum pump and brake device, resp. suction bridge hoses to transport the vacuum from the pump to the consumer. Sometimes there is a problem and engine oil is stored in the hoses. In a hose (to the suction bridge) we find a kind of valve, probably to prevent oil from finding its way. Now come the questions: Does anyone know about the valves a part number or name? Do they belong in both hoses such valves? If I have found it right, the hoses made of polyamide PA12 PHL are in the dimension 12.5 · 1.25 mm or 12 mm outside diameter and 10 mm inside diameter. Can anyone confirm this? Thanks and Gruss Michael