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The PARKER 3-1 HBZ-SS is a compression tube union designed to join two lengths of tubing in a straight-run configuration using compression-style end connections on both sides. Constructed from stainless steel, this union delivers corrosion resistance in demanding fluid and gas system environments. It accommodates a tube outside diameter of 3/16 x 1/16 inches and is rated for a maximum working pressure of 10300 psi, making it suitable for high-pressure instrumentation, hydraulic, and process lines. Licensed plumbers, pipefitters, and instrumentation technicians install this fitting in both shop-fabricated and field-installed tubing assemblies.
This union is applied in residential and commercial settings wherever stainless steel compression fittings are required. Typical use cases include instrument tubing runs, pneumatic control lines, chemical process piping, and high-pressure hydraulic circuits. The compression x compression end configuration allows connection without welding or flaring, reducing installation time in tight spaces or retrofit applications.
Designed as an OEM-style replacement or new-install fitting for stainless steel compression tube systems requiring a straight union connection in high-pressure instrumentation or process piping applications.
Installation is performed by licensed pipefitters, instrumentation technicians, or plumbers following applicable codes such as ASME B31.1 or B31.3 for pressure piping. Depressurize and isolate the tubing circuit fully before disassembling or installing any compression fitting. Ensure tubing ends are cut square and deburred before insertion to achieve a proper seal. Do not over-torque compression nuts, as this can deform the ferrule and compromise the seal integrity.
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