The tube connection is sized for 6mm outside-diameter tubing and 4mm at the reducing connection. Match the actual tubing OD, not its nominal internal diameter.

It joins 6mm outside-diameter tubing to 4mm outside-diameter tubing at a 90-degree angle.

No. It changes the tube connection size; it is not a pressure regulator or adjustable flow-control valve.

The P-Series fitting family is described for industrial compressed-air and vacuum service. Confirm that the tubing, O-rings and pressure or vacuum conditions are appropriate for the complete system.

Isolate pressure or vacuum first. Depress the release collar fully and pull the tube straight out. The Click-Click feel and sound are associated with depressing the collar during tube release, not with inserting the tube. Cut the tube end square before reconnecting.

The fitting body is acetal engineering polymer (POM), with the separate gripping, sealing and any threaded components identified in the specification table.

No potable-water approval is stated for this P-Series fitting. Use a product with documentation explicitly covering the required drinking-water standards rather than assuming pneumatic fittings are certified.