By blowing 30 psi air through the city water first, and bypassing the water heater, I found that when I opened every tap and toilet until air ran through, that I had very little water (only a dribble) when I later opened the low point drains. I closed them back up, and ran the pink through the pump using the equipped suction hose, and ran pink through every tap. I'm confident the air blown through the city inlet removed any water from that device. After making sure I had some through each P-trap, and into empty gray and black tanks, I then ran the level in the toilet bowl up a few inches, to compensate for any evaporation. You want to keep that seal wet!
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Marty and Martha
2015 Z-1 211RD
2012 Nissan Titan
Dalzell SC
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