[jimburgett]

WE have a series 20 washing machine. The pressure valve part # is PS729527. My problem is there is no diagram showing what the part is (which looks like a simple little plastic box) on the side of the tub (back side) that the small hose from the pressure switch hooks to. When I put a small amount of pressure to the pressure switch the timer and machine work fine. I need to find out what that little box is. Any help would be appreciated.

[denman]

I cannot find it either
As far as I know it is just a connection point so the water can get into the tubing which goes up to the water level (pressure) switch

Could be it is plugged with gunk
Could be your tubing is cracked or not sealing correctly at the level switch
If it was not sealing at your tub connection it would probably leak water