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The PARKER 4 VLO-S is a 45-degree male elbow compression fitting designed to connect 1/4-inch OD tubing to an NPTF port using an O-Ring Face Seal (ORFS) interface on the tube end. Constructed from zinc-plated steel, it delivers a rated working pressure of 6,000 psi, making it suitable for high-pressure hydraulic and fluid power lines. The NPTF thread is sized at 1/8-27 and provides a pressure-tight mechanical seal without sealant when properly torqued. Licensed plumbers, hydraulic system technicians, and industrial maintenance professionals typically install this fitting in fluid power and pneumatic plumbing assemblies.
This fitting is used in residential and commercial hydraulic systems, fluid power circuits, and industrial plumbing applications where a 45-degree directional change is required between a tube line and an NPT-ported component. The ORFS end eliminates the risk of leakage common to flare-only fittings under vibration or pressure cycling. It is commonly installed in pump outlets, valve blocks, cylinder ports, and manifold assemblies where routing constraints prevent a straight connection.
Designed as an OEM-style compression fitting for hydraulic and fluid power systems requiring a 1/4-inch OD tube connection at a 1/8-27 NPTF ported component via an O-Ring Face Seal interface.
Installation should be performed by a qualified hydraulic technician or licensed plumber familiar with high-pressure fluid systems. Depressurize and isolate the hydraulic circuit completely before removing or installing any fitting. Inspect the O-ring for damage before assembly and ensure the ORFS sealing face is clean and free of nicks. Follow the fitting manufacturer torque guidelines and applicable fluid system codes when making final connections.
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