Parker 4 Elo-s Tube Union O-ring Face Seal 9200 Psi

Product Description

The PARKER 4 ELO-S is a steel compression tube union with O-Ring Face Seal (ORFS) end connections, designed to join two tube runs in high-pressure hydraulic and fluid-power lines. Built for a 0.25-inch outside diameter tube and rated to 9200 psi maximum working pressure, this union provides a leak-resistant metal-to-metal and elastomer-sealed joint that holds up under dynamic pressure cycles. The UNF thread standard ensures precise mating with compatible ORFS fittings across the assembly. Installation is performed by hydraulic system technicians and fluid-power mechanics in industrial, mobile equipment, and heavy-duty applications.

The 4 ELO-S suits high-pressure tube assemblies where vibration, pressure spikes, or fluid compatibility concerns make threaded ORFS connections the preferred choice over flared or compression-only alternatives. Typical install scenarios include hydraulic circuit fabrication, machine tool plumbing, and mobile equipment repair where 0.25-inch tubing is routed through tight spaces and a union is needed for in-line service access or tube-length correction. Steel construction makes it suitable for petroleum-based and compatible synthetic hydraulic fluids.

Key Features

• 9200 psi maximum working pressure rating for high-demand hydraulic service
• O-Ring Face Seal (ORFS) end connections deliver reliable leak-free sealing under pressure cycles
• UNF thread standard for precise, consistent mating with ORFS hardware
• Steel construction provides strength and durability in industrial and mobile equipment environments
• 0.25-inch tube outside diameter fitment covers common small-bore hydraulic lines
• Sold individually — single-piece minimum order quantity

Compatibility

Designed as an OEM-style replacement or new-installation fitting for high-pressure hydraulic tube assemblies using 0.25-inch OD tubing with ORFS end connections and UNF threading.

Installation Notes

Installation should be performed by a qualified hydraulic technician or fluid-power mechanic. Depressurize and isolate the hydraulic circuit fully before disconnecting or assembling any fittings. Inspect the O-ring sealing surface and O-ring for damage before assembly; a damaged O-ring or scored face will result in a leak path. Torque fittings according to the system designer or PARKER published assembly specifications for the fitting size and material — do not over-torque steel ORFS unions.