Rotary Pneumatic Connector
KSH Pneumatic Connector for high speed rotary request
Hollow Shaft is available with inner M5 screw for PNP Machine
http://www.robotdigg.com/product/85/Nema11+Hollow+Shaft+Stepper+Motor
Note: Nema8 hollow shaft stepper do Not need this connector. ID2.5mm*4OD hose can get through the hollow shaft of the nema8.
KSH04-M5_90, KSH06-M5_90 which are 90 degree connector