The tube connection is sized for 1/4" outside-diameter tubing. Match the actual tubing OD, not its nominal internal diameter.

No. PU1/4 joins two 1/4" outside-diameter tubes in a straight line.

Use a straight union for coaxial tubing runs; choose an elbow where the tubing needs to turn through 90 degrees.

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.