What do you mean by "pressure fill?" They all had a fill determined by the pressure on an air dome that tripped the water level switch to stop filling and begin agitation. If there was no water level selector switch, it only filled with the full amount of water. I believe that even the most basic of the machines would agitate dry at the 2 minute mark so if you wanted to use less than a full tub of water, you might be able to set the timer at the 2 minute mark and keep resetting it each time it went into drain to wash a lower than full load. I know that some basic WP machines even into the early 60s, maybe, had a portion of the wash cycle that did not allow fill and the timers could be moved to that area to wash with less than a full tub of water. I did not look at these KM machines' dials closely enough to see if they had the same feature.