Originally Posted by Iceni John
The second photo is the four air tanks' drain valves, but what is the fifth valve on the right for? It looks like it's connected to something - what? Those are not the original valves: Crown used Bendix truck valves, and yours look like gas valves. I used my unused fifth position for a new bulkhead fitting and valve to connect my on-board electric air compressor to the Accessories tank and to three air outlets around the bus, and I now can also connect my Accessories system directly back into the wet tank, useful if I need to fully air up the whole bus from external air.
Bringing this up because I haven't looked at some threads that I started. I think that last or 5th valve was just like an auxiliary. Maybe I can put that to use cleaning up dust. I have a 150 psi tank discharged laying on it's back in basement storage but I wouldn't mind unloading it to a garage when i have a permanent parking spot.