Stock pump/thermostat housing outlet/inlets on the 20B measures 1-1/4" id,
1-1/2" od with cast in barbs. So the butt weld would work with the barb
ground off.
So put me down for 6 of the most compatible size (is there more than one
now?) that you are going to make. The 1-3/8" id may not work for me.

Marc Wiese 20B in something this way comes.....

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