Part Number Thread Size Hex Size For Tube Size Material Special Notes 84-2303 tee fitting . 9510 Self Taping 9501 4-40 3/16 " 9502 6-32 3/16 " 1008 6-32 3/16 " 2008 6-40 1/8" . 54-2201 5mm 8mm Brass HP 54-8802 Brass K&B .18 84-0101 8-32 1/4" Aluminum 1102 Webra 54-8902 10-32 1/4" Brass 84-6101 6-40 84-M4603 3.5mm 984-001 4-40 Steel Long Thread to replace back cover screw for pressure 984-002 10-32 NA Brass Bent with Flange nut for thin wall tuned pipes 984-003 10-32 NA Brass Straight with Flange nut for thin wall tuned pipes . 54-2101 4mm 6mm Brass HP Fraction sizes for tire size and width are close, but not exact.