I have a plug that goes in the pipe joining the cold sap float box to the flue pan, but there are 2 adjoining pipes with a partition between them. Each compartment has a drain valve, I plug that compartment, drain it, then remove the plug and that refills from the flue pan. Then I repeat for the other compartment.
The first compartment is where the sap enters from the pre-heater, the second one is where the float is, so it doesn't get affected by the entry of sap's turbulence, just controls the flow according to the flue pan sap level.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.