Hi, I've got a heap of these stainless steel vents manufactured so get in touch if anyone needs one.
ventricles by frostie's, on Flickr
I wasnt happy with other vent systems available so this is my solution
Theres a little lip around the female part so the male part sits flush on the board. Just 2 turns of an allan key and the the board is vented by the cross hole in the hollow male part
They come with female knurled part, male hollow bolt with 3mm allan head, nitrile rubber washer and an allan key along with fitting instructions
£10 each plus postage, Bulk discounts available too
swing me an E mail @ firstname.lastname@example.org