Threaded adapter for use with platinum or other electrodes that normally would be step sealed to glass. With threaded bushing and silicone rubber septum for sealing, the electrode may be adjusted for depth or removed if desired. Capillary of glass is 11/2-2mm with 76mm of stem for sealing to apparatus. Size is determined by bore of hole in bushing. Overall length of glass approximately 140mm. Supplied complete with one 12901 septum and bushing.