I noticed that fluid was squirting out the check valve hole. I took it apart and it was all gunked up. It is all clean, but something doesn't look right... the black valve/stopper has a pin sized hole in the center of it, which looks original, but doesn't make sense to me. That would seem to allow air into both the squirter lines AND the supply line, not to mention fluid to squirt straight out the hole in the red cap. Is a hole in the black thingy normal, or has it developed?