Used with aluminum packing box

For shaft speeds of 1000 r.p.m. and higher, and vacuum operation down to 0.5 mm Hg. The seal is made entirely by the packing box. Only infrequent lubrication is required using packing and Stir-Lube. We recommend that you use certain ACE vacuum adapters to avoid contaminating the flask contents with lubricant. For use with 9 mm O.D. shafts.