I was reading here about wells need a vent. The top of mine has the seal that is down inside casing and you can't unscrew it or the bottom part will fall into the well. Has the pipe coming out and a spot where wiring comes out. Then it has a blue plastic screw in plug. Mine is screwed in so I was wondering if I needed to loosen it some or it's OK? Mine is inside a pump house so it's out of weather. It has been this way for 17 years now because I had to buy a new pump then. Let me know if I should loosen it up.