Glass bearing with Ace-Thred at each end and glass tubing between, for use with 10mm O.D. stirring shafts. PTFE coupling, with internal FETFE O-Ring seal, connects bottom of bearing to #25 Ace-Thred on vessels. Top bushing also has an internal FETFE O-Ring seal for additional seal on shaft to allow pressure reactions. Maximum operating speed 600 rpm. Coupling and bushing supplied with FETFE O-Rings.