What is this?

wdk450

Well-known member
Are we talking about a round cap vent that looks like a big mushroom? The cap unscrews on these and gets lost but you can find replacements online.
 
It looks like something might have come loose or worn out. It’s definitely not supposed to be wide open like that there’s probably a missing cover or part that keeps it sealed. You might want to get it checked out soon!
 
Top