Vacuum flanges KF10 - 312 KF16 - 314 KF25 - 320 KF40 - 326 Ultratorr fittings 1/16 - 001-1/2 micro 1/8 - 006 3/16 - 008 1/4 - 010 3/8 - 012 Laser Chamber Windows Small - Kalrez 218 mcmaster/9568K72/ Large - Kalrez 223 mcmaster/9568K644/ Ultratorr fittings 1/4" - Kalrez 010 mcmaster/9568K15/ Airlock big window - either will work, channel dimensions suggest 1/4 3/16 - 344 mcmaster/9464K598/ 1/4 - 420 mcmaster/9464K744/ Costech AS, Helium vent - ?003 mcmaster/9464K103/ Crushing room shatterbox Needs four - extras inside base - 333 mcmaster/9464K56/ ____________ Cross-section 0** - 1/16 (001 or less, through 003 - micro) 1** - 3/32 2** - 1/8 3** - 3/16 4** - 1/4