Picture posting is enabled for all :)
I've inherited a couple of these (Jemp vents, as discussed on here a mere ten years ago, if you use the search function...) - but am not sure how to test them to see whether they still work. I've left them on a radiator and they haven't moved so I fear they are bu**ered, but would like to be sure that they are beyond redemption first. Any bright ideas?Adrian (no reason other than I am amused by a forum that has a purple sperm as a smiley)