I have inherited my trailer that was just off a repair due to a burst frozen fresh water line fixed with pex. I believe the PO only used it boondocking (no city), so hence the repair location. The rest of the plumbing is original(?) copper which has been removed and pictured. I have pexed the easy part (sinks, shower, on my way to the water heater-city water-fresh water junction. The most confusing thing is this drain with no valve in direct proximity that is just above the water supply to the water heater. I have not used the hot water due to a bathroom in disrepair (that I am now repairing) among other issues. There is a hot and cold drain at the rear of the trailer and what I guess is a fresh water drain right near the fresh tank that is copper (and also the AC drain. Wondering what this drain is and how to best pex this area behind water heater. Owners manual does not have a schematic, but I would love to see pictures of a proper configuration in this area.
Picture shows old copper with low tech labeling (no, I do not do elementary school science projects
). More pictures to follow. Apparently one at a time is all my phone/data collection can handle. Thanks.