My Seeburg MO has the identical pipework as the Reproduco.  The rotary
pump is there to provide suction for the pneumatic system that reads
the roll and plays the piano.  There should be a separate blower for
the pipes.

In the Seeburg both of the pumps are in a remote box about two feet
wide by four feet long by two feet high.  Inside there is a rotary pump
and a blower both powered from a twin shaft motor.  Mine is located in
my workshop under a work bench about 75 feet away from the organ and
works perfectly with no loss in pressure.  I have a 3" and 1-1/2" PVC
pipe connecting the two.  They are hidden outside along the side of
the house and come in through the wall.

Randy Hayno