opportunity to rout my fills when I redid all of my stuff. I put my diesel and pup-out on the port side. Hopefully, I can only put diesel into the holding tank. Smelly, but survivable.
I put two water fills (one for port tank and one for starboard tank) on the starboard side. When I put them in, I put the filler label “WATER” for the port tank on the inboard (port) side and the starboard water filler label on the outboard (starboard) side so I can remember which tank I am filling.
Greg