I wouldn't worry much about the corrosion; these only seal on the bevel part, so it's pretty easy for rainwater to get to the threads - I've cleaned dozens of JIC's up with a fine wire brush on the threads, shined up the bevel with gray scotchbrite, they never leak. If it sits out in the rain a lot, maybe dab a little never-sneeze on the threads when reassembling.
The bevel on that one looks a LOT like a 45, but I'd take that fitting with you if you're gonna get some hoses made, kind of a spendy mistake if you're wrong - also, if you can't find a protractor you could slip a round rod into the hole on the male end (as snug a fit as possible), then hold the square end of a ruler against the bevel so that the length of the ruler runs toward the far end of the inserted rod - if you can hold all that steady, then for every inch you get from the fitting, the ruler whose end is against the bevel should be an inch further from the inserted rod. It's just like roofing; a 12/12 pitch is 45 degrees.
BTW, a 37 degree angle is almost exactly 9/12 pitch - so there's a little "wiggle room" in this endeavor and STILL probably get it right... Steve
