The QR1 (quick release) series offers inch and metric (ISO-G) program for pneumatic components and is equipped with plastic, oval release ring that lets connection and release of compressed air-tubing. The mini design for plastic tubing ODs of 1/8 to ¼ in. and 3–6 mm. The standard fittings can be used for tubing ODs of 5/32 to ½ in. and 4–16 mm. Check, ball, and flow control valves are included in the range of function fittings