Thijs,
Thanks for the nudge to go out and dig the trailer out. I needed to put a few items in there as well.
Here are some additional pictures and measurements for you.
The smaller of the two outlets is 44mm diameter (1-23/32 inches for us American guys
)
The larger outlet is 49mm diameter (1-15/16 inches)
Both are 24mm (1 inch) long
They're arranged in a true wye (45 degrees off the main inlet)
The wye is rotated approximately 30 degrees off vertical with the larger outlet away from the firewall and at the top of the heater.
The larger outlet also has a bead rolled in it that's about 24mm long and standing about 5mm above the diameter. The bead is centered on the 24mm length of the outlet. That would help hole the hose in place.
