Huh, a PO must have changed things a bit. I have LaSalle Bristol 3" waste valves. I've order 2 replacements.
I should be able to loosen stainless steel screw ring clamp on tank side; undo four bolts holding waste gate in, remove and insert new waste gate, and bolt everything back up.
This is where I should do a Mayco and say "easy peasy"; shouldn't take 10 minutes.
But I know better than to say that.
Bought two new valves with seals and bolts for $61 and change, Canadian, delivered.
I"ll let you all know how it goes.