Self-aligning, lubricant free PTFE Trubore bearing or combination bearing / debris trap. Use with 8076 (19mm od) or 8080 (28mm od) polished glass stir shafts. Debris trap model prevents bearing-wear particles from contaminating the reaction vessel and has a side port for clean-out, evacuating or purging. You can stir in either direction and achieve vacuum down to 1mm Hg. Not recommended for use with precision ground glass shafts.