Hi, and welcome to the group from Connecticut!
The Blue and Red valves are your low point drains for the hot and cold plumbing. They will drain quicker if you open your sink and shower faucets while draining.
A picture of your hose fittings would help, but I am betting that one is your fresh water hook up. The other, probably lower down is probably your black water rinse fitting. They should be marked.
Good Luck,
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Steve & Jan, Ava & Emma (Mini Schnauzers):
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