QS-1/4-12-I Festo | Festo QS Series Straight Threaded Adaptor, R 1/4 Male to Push In 12 mm, Threaded-to-Tube Connection Style, 190649 | 121-6212 | RS Components
Festo 153032 QS-6 Push-in Connector Minimum Order Requirement 10/ Order in Multiple of 10: Amazon.com: Industrial & Scientific
FESTO Adapter FOR TUBE PUN AND PAN B2 186296 QSK-G1/4-6 | eBay
QS-1/2-12 Festo | Festo QS Series Straight Threaded Adaptor, R 1/2 Male to Push In 12 mm, Threaded-to-Tube Connection Style, 153010 | 121-5607 | RS Components