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The NORGREN C00230604 is a straight stem reducer push-to-connect tube fitting made from brass. It connects a 4 mm outside diameter tube to a 6 mm outside diameter stem in a single inline configuration. The push-to-connect design allows the tube to seat and seal without tools, reducing installation time in pneumatic and fluid control lines. It is rated to 150 psi maximum working pressure and operates across a temperature range of 0 degrees F to 175 degrees F. An internal nitrile O-ring provides the primary seal. This fitting is installed by HVAC technicians, pneumatic system builders, and industrial maintenance trades working on compressed air or low-pressure fluid circuits.
The C00230604 is suited for residential and light commercial pneumatic control lines, instrument air tubing runs, and fluid distribution systems where a tube outside diameter must step down to mate with a smaller stem port. The straight body keeps the flow path direct and minimizes pressure drop across the connection. Its compact overall length of 41 mm fits in tight panel or manifold installations. The brass construction is compatible with dry air, nitrogen, and many non-aggressive fluid media common in HVAC controls and pneumatic actuation applications.
Designed as an OEM-style replacement or new-installation straight stem reducer fitting for pneumatic control and instrument air tubing systems using 4 mm OD tube and 6 mm OD stem connections.
Depressurize and isolate the circuit before removing or installing any push-to-connect fitting. Ensure the tube end is cut cleanly and squarely, free of burrs, before inserting into the collet. Verify that the tube is fully seated by gently pulling back against the collet after insertion. Inspect the connection for leaks after restoring system pressure.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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