My Alante has 4" drains on both grey and black, and empties very fast, I have a macerator for use at my home dump station but it is much slower with a 1" hose, even pressurized as it is.
I did see a guy at Black Butte Lake just pull his 5th wheel up on the dump station apron and prop open the door and then pull the handles! Made quiet the mess.
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2016 Alante 26AY
Roadmaster Braking, BlueOX Tow Bar.
Kelderman Air Ride, Safe-T-Steer, Supersteer Trak Bar rear w/ Sumo Springs.
400 AH LiFePo4 house batt w/750 watts solar 40A charger & 2500 watt whole house Inverter.
2021 Ford Ranger 4X4 Toad
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