1-18
The 1-18's with perforated tub will also suck suds back in. I just wired around my water level switch to get a dry agitate. The 1-18 does require the "pump priming" of 10 seconds of fill, then immediate spinout, then I flip my switch to dry agitate and immediately get the suction going. Do it all on low speed, it works for me. The 75 Filter-Flo also requires the pump priming 20 seconds of work, while my "monkey-rigged water level switch suds machines-dry agitate" 79 Maytag and 60-WP both almost always suck immediately in dry agitate, especially the 'Tag, never a problem..
I do not own any genuine suds machines, but I have rewired and gotten all to work so far. Someday I'll find a real one, I hope.
My 78 Norge, I mis-wired and am currently getting agitation that starts as fresh flume water enters, I need to splice into a different water level switch wire for try #2, dry agitate. But I did at least shut off water valves, and yes it sucks back the suds with no priming. Soon I'll try wiring attempt #2.
While I wish all my machines were truly automatic suds machines, I have found easy ways to get them all to be "manual suds savers." For hobbyists like many of us, I find the once a week of evening of 4 machines with one wash water to be a fun and busy chore, swapping hoses from tubs to drains and such. But many would prefer a real automatic suds machines like many from the 50's, I don't blame them.
My only problem----whites! I start with very hot water, and Biz and OxiClean and powder detergent, and let them soak, but I am afraid of Clorox because the next load isn't white. If I do occasionally add Clorox, which I like for whites, that's the one load where I do not save suds. Am I a chicken about "used" Clorox damaging the next load? With summer coming, I do lots of white socks, Tees, etc, more than winter.