A handy little addition to the wet bay of the coach: a clear sewer hose extension, attached below the sewer valves.
This enables me to better see the water draining from the black and grey tanks; the other end of the hose has a clear portion too, which is also useful, but this lets me see the water before it drains the length of the hose:
Here it is in context, draining the grey tank (from the sinks, shower, etc):
