[Gonefishing]

Went to winterize my 2021 Montana 3761fl. It’s different then my last keystone. This one has a connection for the antifreeze hose. I noticed there is a valve of some kind in the connection If you push on it it goes in I’m assuming it’s made so when the pump is turned on the antifreeze goes in it pushes the valve and allows it to flow through the lines. Can this valve be removed? When I winterized the unit it took forever to get any antifreeze to come out the faucets. Could hear pump running but nothing coming out. Had to go outside and pour antifreeze into the hose in order to get any to draw into the lines. Thinking the valve was not opening enough to allow it to flow. Any suggestions