This is the TW discharge pump.
It is white with 1 duckbill on each side
and it has left hand threads.
This is the SW Vacuum Pump used with a white cylinder vacuum tank

This pump is black with right handed threads and 4 1 1/2" duckbill valves.

The pump above is the JW used on the Vacuum Generator tank which is a white rectangular tank.
This Vacuum pump takes the 2" duckbill valves and is used with the Vacuflush toilet system.

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