19 mm Pressure Bearing, stir shaft,complete with #25-#25 Trubore® glass bearing, #25 PTFE bushing and #25-#25 PTFE coupling. Internal o-rings within the bushing and the coupling are size -116 FETFE® (7855-726). External o-rings are size -220 FETFE®, (7855-742). Use only with 8076 polished glass stir shafts.