I used to think deer wouldn't chew the lines, until while hunting a few years back, I watched them chew thru 2 lines. The chew marks are not like a squirrel chew at all, no nibbles, they seem to leave a flat chew mark, often in almost 1/2" flat marks. Deer do absolutely chew maple tubing. In fact that year I saw a deer chewing the lines, I got a short video of it. I sent that to the DEC to show them, since that time I've been getting nuisance permits to reduce the problem. The unfortunate part is that I no longer hunt and some years I have a hard time finding anyone who wants to be an "agent" and hunt during Jan thru March. My permits at first ended March 31, more recently they have expired April 8 or so.
One issue seems to be when they gut a doe in March, it's very obvious they were pregnant.
Dave Klish, I recently bought 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.