URO Parts 1168000378 Vacuum Check Valve
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My silicone hose was 3mm but I think a hose clamp will let you use up to 4mm. Alternatively, the stock Mercedes breather hose can be used as well. There is almost no difference between the two. Please let me know if you have any questions.
Selected User Reviews For URO Parts 1168000378 Vacuum Check Valve
The product doesn't indicate a suitable match, but I can confirm that it is good enough to replace a R/C Crossfire, without risking damage to it. This would also apply to other vehicles that are powered by the same Mercedes engine. There is no flow direction arrow, but anyone who looks at it will realize it is obvious.
I used the part on my 2003 A4 with the v6 engine.
The product is great. The seller is great.
Has performed the duties it was supposed to perform.
It is not possible to determine the flow direction of air by looking at the valve. Furthermore, the valve does not interrupt either airflow in one direction or the other.
I like it.