The Gore Glass-In Vent is "Self-Venting" which means there is no need to open and close it. Featuring a vent screw with a Gore-Tex membrane.
The Glass-In Vent is designed to be installed prior to hotcoating and glassed over. Installation requires a 1" forster bit (preferred) or short-bit holesaw (similar to the FCS X2 holesaw).
Screw size: M12x1.5