I made an air to water adapter for blowing out the system rather than using the adapter with a "valve stem" where you have to hold the air hose on it.
Male 3/4 hose brass fitting to 1/2 NPT male.
1/2 NPT female to 1/4 NPT female brass coupler.
1/4 NPT male air fitting (I use the industrial, brass version).
Screw it all together with teflon tape, attaching a water pressure regulator to the hose end.
Screw the water pressure regulator into the trailer's city water port.
Attach air hose (air pressure now doesn't matter, but I still turn it down to 40-50 PSI).
Turn on air and open faucets one at a time, near to far sequence, including flushing toilet and outside shower.
Attach to black tank flush and blow that out.
Simplifies the process.
Edit: all this sfter draining the HW heater and bypassing it.
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Desert185 🇺🇸 (Retired Chemtrail vendor)
-Ram 2500 QC, LB, 4x4, Cummins HO/exhaust brake, 6-speed stick.
-Andersen Ultimate 24K 5er Hitch.
-2014 Cougar 326SRX, Maxxis tires w/TPMS, wet bolts, two 6v batts.
-Four Wheel 8' Popup Camper.
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