I also use Happy Camper in my Dometic 310. When I put my rig into storage, I put some extra water in the bowl, and put in a little RV holding tank drain valve lubricant. Keeps the seal lubricated.
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'05 F250 6.0 Bullet Proofed - Sold
'17 F350 6.7 Lariet
'02 Montana 3280RL Upgraded a bunch.
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