In response to the question posted by Dan Bixler MMD 060320, both
of the spill units have three nipples venting to the atmosphere.
They connect to nothing.  The bottom-most nipple (the fourth nipple)
on the valve unit is indeed teed to the number six intensity valve.

The original factory tubing on these two vent valves is a "silencer"
tube on each of the three vent nipples.  The free end of the "silencer"
tube is cut at about a 45 degree angle to identify it and help in the
silencing.  Ideally, the three vent tubes are routed to different
locations to spread out the venting sounds.

I don't think you have a problem.

Bob Taylor
http://members.socket.net/~rtaylor/aeolian_pipe_organ.html