10 Vacuum Connectors. 3/16 X 1/4 X 3/16 In. Hard Vacuum Tubing Tee. Diameter (in): 3/16 X 1/4 X 3/16; Vacuum Fitting Sizes Included: (10) 3/16 X 1/4 X 3/16. Dorman manufactures a comprehensive selection of Vacuum and Emissions Fittings for almost any automotive Vacuum job. We also offer Vacuum Tubing, sold separately.