Parker 4FSC6N-B Compression X Fnpt Tube Connector

Product Description

The PARKER 4FSC6N-B is a brass compression tube connector designed to join compression tubing to a female NPT threaded port. This fitting uses a 3/8-18 inch thread size and transitions between a compression end and a female NPT (FNPT) end, making it a standard choice for instrument and fluid system connections. With a maximum working pressure of 3500 psi, it is built for demanding service in hydraulic, pneumatic, and instrumentation plumbing applications. Plumbers, pipefitters, and instrumentation technicians install this fitting where a reliable metal-to-metal compression seal is required alongside a threaded port connection.

This connector is suited for residential and commercial plumbing, HVAC refrigerant-side instrument lines, and industrial fluid handling systems where compression fittings meet NPT-ported components. Typical install scenarios include connecting tubing to valve bodies, manifolds, gauges, and other NPT-ported equipment. The brass construction provides good corrosion resistance and machinability across a wide range of fluid media. This fitting carries a Product Service Code of 4720, indicating standard fluid coupling hardware.

Key Features

• Brass construction for corrosion resistance and reliable sealing in fluid systems
• Compression x FNPT end connections for transitioning between tube and threaded port
• 3/8-18 inch thread size with FPT thread standard
• Maximum working pressure rated to 3500 psi for high-pressure instrumentation and hydraulic service
• Compact, single-piece connector design for straightforward installation

Compatibility

Designed as an OEM-style replacement or direct-install brass compression connector for fluid handling, instrumentation, and plumbing systems using 3/8-18 FNPT ported components. Cross-references to Swagelok part number B-400-7-6.

Installation Notes

Installation should be performed by a licensed plumber, pipefitter, or qualified instrumentation technician. Depressurize and isolate the system completely before removing or installing any compression fitting. Do not overtighten the compression nut, as brass fittings can be damaged by excessive torque. Follow applicable plumbing codes and manufacturer guidelines for compression fitting assembly and leak testing after installation.