Help with 2017 surveyor 243RBS

I feel I must recap, I took my camper back to the dealer after the last camping trip to have him fix a couple things, I told him it was not winterized as a precautionary measure, he said if it gets cold it was on him to take care of it, so last night I get ready to run the pump to drain the tank as I could not find a hose to drain "what I thought was a fresh tank with 30 gal of water in it " and low and behold pink cam out of the lines..... soooooo as it turns out he was unsure about how cold it was going to get one night and had his boys go on and winterize it, they left off the drain cap ( that is where the confusion came for me ) It also would have helped if someone would have said something about it when I picked it up.

thanks for the help though.

Dar