Parker 12 HL6-S Swivel Union O-ring Face Seal 3/4 Inch

Product Description

The PARKER 12 HL6-S is a compression tube swivel union with an O-Ring Face Seal (ORFS) end connection, manufactured in steel. This fitting creates a leak-resistant, high-pressure hydraulic or fluid system connection by joining two tube lines at a swivel joint, allowing for rotational alignment during assembly without twisting the lines. Rated to 6000 psi maximum working pressure, it is built for demanding industrial and mobile hydraulic applications. The ORFS interface relies on a face-seal O-ring to achieve a positive, vibration-resistant seal at both ends. Licensed plumbers, hydraulic technicians, and fluid power specialists are the primary installers of this component.

This swivel union is suited for high-pressure hydraulic lines, mobile equipment fluid circuits, and industrial piping assemblies where tube alignment flexibility is required. The 3/4-inch outside diameter tube connection and UNF thread standard make it compatible with standard hydraulic tubing and fittings used in construction equipment, agricultural machinery, and industrial fluid power systems. The ORFS design minimizes the risk of leakage in high-vibration environments where flared or pipe-thread fittings may be less reliable.

Key Features

• O-Ring Face Seal (ORFS) end connections for positive, leak-resistant sealing
• 6000 psi maximum working pressure for heavy-duty hydraulic service
• Steel construction for durability in high-pressure fluid power applications
• Swivel union design allows rotational alignment without line twist during assembly
• 3/4-inch tube outside diameter with UNF thread standard

Compatibility

Designed as an OEM-style compression tube swivel union for high-pressure hydraulic and fluid power systems using 3/4-inch OD tubing with ORFS end connections and UNF thread standard.

Installation Notes

Installation should be performed by a qualified hydraulic technician or licensed fluid power specialist. Depressurize and fully isolate the hydraulic circuit before removing or installing any fittings. Inspect the O-ring face seal surface for nicks or contamination before assembly, and ensure the O-ring is properly seated and lubricated to achieve a reliable seal. Follow system-specific pressure ratings and applicable fluid power industry standards during installation and torque procedures.