S.K, I use both the blowout, and add a small amount of antifreeze via the suction hose so it just goes into the pump. Protect that mechanism in there....
Bob & Sharon
2019 Winnebago Travato K (2018 Chassis)
Past RV's: 2013 WGO ERA 70A, Chevy PW Lexor
Itasca Navion, 29' Jayco 5th Wheel