Anyone use a water meter?

No, there both blue overflows , no shut off on them. My low water drains are elseware. I may see, later in the week, if they vent. I will cover them with a bag and see if air exits them while filling the tank, then blow them out. No easy way to trace or replace them as i said, its a closed bottom camper, thats insulated and spray foamed. So to take it apart would be doable but time consuming, especially if not needed. And ive had the line clogged on the pup before, but as stated, if its not a gravity fill it should blow out. But we will see. I did get everything sanatized today, so that good. And if i remember the valves, and mark them ill be good. Just not a great system. The city water comes in from the wall and hits a line attached to the pump, then there are 2 shut offs, so you have to turn on the tank fill, and it goes through the floor to the tank. You also have to shut off the other valve, i think to isolate the pump. Then , to use the pump reverse the process. So its a pain. The diagram in the manual is , as you guessed almost useless. It lists a silver shut off, that i dont have.