Help with winterizing Sunnybrook harmony thx

Thanks jerry. I think I have the hoses figured out that go into and out of the pimp. My dilemma is how to bypass the hot water tank. In the lower right you will see tow white tabs on the hot and cold line, they pull out. The second pic is a zoom shot of those valve tabs. I am thinking that my be the bypass somehow but I'm not sure. Otherwise maybe the bypass is under that bed board which is the third pic. If those white tabs are not a byoass, question is what are they?

Thanks