I was wondering what the caps are on pipes both on the front and on the back part of the roof. I know that they are not the vent pipes for the plumbing. They are about 4-5 inches in diameter. When I was washing the roof, I noticed that they spin. Is it right for them to spin?
I believe those are the attic vents that are features of Montana. They help keep moisture out of the rafter area. They are bigger around than the plumbing vents, but I think I only have one near the back.
Mine screw on. They have a 1/4 in. screw made in the middle and screw into the part on the roof.
You may want to check yours by turning clockwise and see if they snug up.
If they are just spinning you may loose one.