The QR1 series is Aventics' compact push-in fitting line for pneumatic tubing connections — straights, elbows, tees, branch tees, plug-ins, and bulkheads sized for tube outer diameters from 4 mm through 12 mm. Nickel-plated brass and stainless options with NPT, BSPP, and metric thread ports cover most plant air and machine pneumatic plumbing. Tool-free push-in release lets technicians service lines without dedicated wrenches or sealing tape.