BARB TUBE CONNCT RTU-PK-4/4 sold in multiples of 10 only

Barbed Tubing Connector Rtu-Pk-4/4 with Barbed Fitting for Plastic Tubing Pp, Pu, Pr. Nominal Size=3,4 Mm, Operating Medium=Compressed Air In Accordance with Iso8573-1:2010 [7:-:-], Note On Operating and Pilot Medium=Lubricated Operation Possible (Subsequently Required for Further Operation), Pneumatic Connection, Port 1=For Tubing Outside Diameter 6 Mm, Pneumatic Connection, Port 2=For Tubing Outside Diameter 6 Mm, Festo