I think you have it figured out. If you aren't sure about proper installation procedure you may want to go to You Tube and search "install rv winterizing kit" and there are several videos on the subject. There should be brief instructions with the kit. And the pump is not reversible unless you change the power leads since it is 12V DC.
2014 Palomino Puma 25RS
2011 F-150 Super Crew XLT
Days camped in 2014 - 23
Camped 2015 - 47
Camped 2016 - 51 done - 6 more planned so far