Push-in fittings are the best elements for connecting pipes and actuators. Quick and easy to use, the push-in fitting can be re-used thousands of times without affecting the pneumatic and mechanical seal in any way. It comes in various configurations and guaratees a virtually unlimited, highly flexible use. The clamping spring with its special shape grips the pipe without scratching or deforming it, which facilitates release. In the fittings, the release bushing has patended screwdriver slots to facilitate release in applications not accessible to the finger. Configurations 719/T, 704/T, 705/T, 718/A, 726/T, 718/T, 716/T, 729/T (except for Ø 5), have a ring for fixing to the wall asymmetrically in order to contain the head of a screw within the overall dimensions of the fitting.