Festo Instant Equal Coupler QS-4

Official Festo type reference: QS-4 (Festo standard-series push-in connector; Part No. 153031)

The Festo Instant Equal Coupler QS-4 is a compact straight push-in connector designed to join two pneumatic tubes of the same 4 mm outside diameter. Its push-in connection principle allows quick tube installation and removal while maintaining a compact connection footprint. The QS series is intended for pneumatic connection technology and is suitable for compressed-air applications; Festo also documents vacuum and water capability for the QS family, with medium and temperature limits applying by configuration.

Technical specifications

Key features and benefits

·       Equal-size connection for 4 mm pneumatic tubing.

·       Push-in connection reduces assembly time compared with conventional threaded tube connections.

·       Compact standard-series design for pneumatic control and air-distribution assemblies.

·       Blue release ring supports intuitive tube release and servicing.

·       Suitable for tight installation areas where a short straight connector is preferred.

Typical applications

·       Pneumatic control panels and manifolds

·       Compact automation machinery

·       Air preparation and distribution circuits

·       Actuator and valve tubing connections

·       General industrial compressed-air installations

Installation and handling

·       Use clean, correctly sized pneumatic tubing with a square, burr-free cut.

·       Push the tube fully into the fitting until it reaches the internal stop, then perform a gentle pull check.

·       For removal, depress the blue release ring and withdraw the tube carefully.

·       Use the specified thread/sealing arrangement and tighten to the applicable Festo nominal torque; do not overtighten.

·       Confirm compatibility of the fitting, tubing, pressure, temperature and working medium before commissioning.