Vacuum Cups and Suction Cups Vacuum Cup Fittings Barbed Fittings which Push-In from the Top BF3 Vacuum Cup Fittings: Product Photo (Click to Enlarge) Vacuum Fitting Part No. Connection Thread Size Hex Size in. (mm) H Height in. (mm) BF3-SHEX BF3-OR The BF3-SHEX barbed fitting screws onto the SLSA-1 suspensions can screw into 10-32 UNF or 5 mm female – small Hex Type BF3-SHEX 10-32 UNF male – fits 5mm Female 1/4″ 0.42 (11) The BF3-OR barbed fitting w/ Captured O-Ring screws onto the SLSA-1 suspensions can screw into 10-32 UNF or 5 mm female BF3-OR 10-32 UNF male – fits 5mm Female 5/16″ 0.51 (13) The “G” thread is also known as BSPP, commonly used world-wide for Vacuum Applications. Note: 5 mm and 10-32 Male screws right into 5 mm Female fittings.