We came home from the hospital today. I have to take care of my husbands drain bag. It has a twist type plug which opens to drain the bag. I was able to do that. But next I am supposed to clean the bag with a saline solution flush. The syringe applicator doesn’t seem to go over the twist type drain plug. This is a blue plug on a uersil bag. It doesn’t look like it comes off and I don’t want to force anything. How do I connect these two things.?