[DutchmenSport]

Others have had the same question and I think some remove the spring inside the hose connection.

But all of us have found that the anti freeze, or whatever you are attempting to suction up in the the winterizing line (including sanitizing solutions), the bucket, or jug has to be at least level with the hose connection. If the jug or the bucket is lower, it won't suction up. Raise the jug (you may need help with a second person to do this), but the thing will start sucking up the antifreeze then.