Sink drain connect to both the trailer and blue gray water tote.
I've made a change in the connection between the PVC pipe and the blue wastewater tank. I now use a 1.5 to 3 inch adapter. The 1.5 inch pipe sits inside of the opening of the blue tank so the wastewater flows inside.
Before draining the lines of anti-freeze, connect both sink and shower drains gray water tote as you need to collect the anti-freeze for proper disposal.
pipe running under pup. Note each end as a 1 1/2 inch slip to thread adapter.
Close up of connection between PVC and tank. The bottom section is lowered down over the tank.
I must confess that I've not camped anywhere where there was a sewer connection. So this set up has never been tested
Sink drain in stored position
Shower drain in the stored position
Shower drain connected to camper