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Hey guys,
I just had my own question here dealing with winterizing. I'll upload the pictures but I have a 3910FB and I was having an issue getting the antifreeze to be drawn into the coach. I had a piece of hose screwed into the upper left port. It looked like there is some sort of check valve that is not working correctly i believe. I had a valve open after looking on here for some answers. I didn't know what i did wrong or if there was a special hose with a little nipple to press the check valve. Just trying to figure out what I was doing wrong. Thanks!
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