Parker 4FSC4N-B Compression Tube Connector Brass 3500 Psi

Product Description

The PARKER 4FSC4N-B is a brass compression tube connector designed to join tubing to female NPT threaded ports in fluid and gas plumbing systems. It features a compression inlet on one end and a female NPT (FNPT) threaded connection on the other, providing a reliable, leak-resistant joint without soldering or welding. Rated to a maximum working pressure of 3500 psi, this connector is suited for high-pressure hydraulic, pneumatic, instrumentation, and process lines. The 1/4-18 thread size is a standard dimension widely used in commercial and industrial piping. Licensed plumbers, pipefitters, and instrumentation technicians are the typical installers.

This compression-to-FNPT connector is commonly used in residential and commercial HVAC, refrigeration, process instrumentation, pneumatic control lines, and hydraulic systems where a transition from tubing to a female threaded port is required. Its brass construction provides good corrosion resistance in water, air, oil, and many gas service applications. The compression fitting design allows field assembly without special tools, making it practical for retrofit and new-installation work in tight spaces.

Key Features

• Compression x FNPT end connections for tubing-to-threaded-port transitions
• Brass construction for corrosion resistance in water, air, oil, and gas service
• Maximum working pressure of 3500 psi for high-pressure applications
• 1/4-18 thread size conforming to FPT thread standard
• No soldering or welding required for field assembly
• Compact, single-piece connector construction

Compatibility

Designed as an OEM-style and aftermarket replacement compression tube connector for systems requiring a 1/4-18 FPT threaded port connection to compression tubing. Cross-references to Swagelok part number B-400-7-4.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified instrumentation technician. Depressurize and isolate the system completely before removing any existing fittings or making new connections. Verify tube diameter and wall thickness are appropriate for the compression ferrule before tightening. Follow applicable codes including ASME B31.1, B31.3, or IPC as required by the system service type and jurisdiction.