Went to winterize our camper for the first time this morning.
Drained and bypassed the water heater. Made sure all of the faucets were closed.
Opened valve to pump from my jug of antifreeze and turned on the water pump.
Took me a second to realize the system wasn't pressurizing as the pump continued to run. Quick shut off the pump and it dawned on me what I had done wrong.
When I parked the camper last, I had opened the low point drains.
Exited the camper and saw that I had about a gallon of antifreeze on the driveway.
Off to the store for more antifreeze.