Quick fitting-Accessories. Push-in fittings by APmatic are the best elements for connecting pipes and actuators. Quick and easy to use, the Metal Work push-in fitting can be re-used thousands of times without affecting the pneumatic and mechanical seal in any way. It comes in various confi gurations and guarantees a virtually unlimited, highly fl exible use. The clamping spring with its special shape grips the pipe without scratching or deforming it, which facilitates release.