Plumbing vents are not specialized Parts on a
casita there are four different types you can get them at any RV
lights or Camping World they're probably put in with pop rivets on a
casita you can do the same or you can get screws for them when you take the old one off make sure you clean the surface very well get some Putty tape to go underneath the vent then put screws down then find some self-leveling sealer White and reinstall very easy job nothing special About a plumbing van standard Vance cost about $3 you want to contact me you can I want to
Casita looking for a third Anthony sharwood 662-380-0655 be glad to help have a great day