Parker 4 Klo-s Tube Union O-ring Face Seal 1/4 in 9200 Psi

Product Description

The PARKER 4 KLO-S is a compression tube union fitting with an O-Ring Face Seal (ORFS) end connection, constructed from steel. It joins two tube runs in hydraulic and fluid power lines while providing a leak-resistant seal through face-seating O-ring contact rather than thread-to-thread metal seating. The fitting is sized for 1/4-inch outside diameter tubing and is rated to a maximum working pressure of 9200 psi, making it suitable for demanding high-pressure hydraulic circuits. Threads conform to the UNF standard. Licensed HVAC, plumbing, and hydraulic technicians working on fluid power systems are the typical installers.

This union fitting is used in hydraulic and high-pressure fluid systems where a straight inline tube-to-tube connection is required. It is well suited for residential and commercial equipment such as hydraulic power units, mobile equipment, and industrial fluid power circuits where ORFS connections are specified. The ORFS design eliminates thread-form leakage by sealing against a flat face with an O-ring, which is especially important in high-vibration environments or anywhere fluid leakage is a safety or contamination concern.

Key Features

• ORFS end connections provide a leak-resistant face-seal for high-pressure hydraulic service
• Rated to 9200 psi maximum working pressure
• Fits 1/4-inch outside diameter tubing
• UNF thread standard for broad compatibility with standard hydraulic components
• Steel construction for durability in demanding fluid power environments

Compatibility

Designed as an OEM-style replacement or service fitting for high-pressure hydraulic and fluid power tube assemblies requiring a 1/4-inch OD ORFS compression tube union with UNF threads.

Installation Notes

This fitting should be installed by a qualified hydraulic or fluid power technician. Depressurize and isolate the hydraulic circuit fully before disassembling any fittings or tube connections. Inspect the O-ring seating face for nicks or debris before assembly, and use a new, properly lubricated O-ring at reassembly to ensure a proper seal. Torque to the fitting manufacturer's specification and verify for leaks before returning the system to service.