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oil check valve

  1. CoreyL

    A: Oil Pipework Check Valve of Unknown Origin...

    How Do, Can anyone tell me about this check valve? It was installed on my single in the oil feed line to the pump. I removed it and tried to blow through it. I found it pretty much impossible to get it to open blowing as hard as I could. I took it apart and it seems to me like the spring is too...