This was part of a greenhouse which was taken down but was in working order, and still should be. It is possible to purchase new cartridges direct from the manufacturer if needed. Installation instructions for a different make are attached, but the method of installation will be similar. I have another one if required which definitely needs a new cartridge and can be taken as well.
Happy to deliver within reasonable distance of Penicuik.
Bayliss Autovent for greenhouse or cold frame (Deanburn EH26)
This offer has been gifted to someone and is no longer available.