The Fresh Water tank arrived in the mail. It was ordered from the same place as the Grey Water tank, and had the same dimensions. But, the fittings were different. I debated what material to use to attach to the fittings, and ultimately decided on Brass. For these threaded connections, there doesn’t seem to be much info about what materials mesh the best. I couldn’t find any decent plastic ones, and I figured these brass ones would last forever. So, I installed the fittings and tried them out.