Parker 4-6 Fbz-b Compression Tube Connector 3/8 Inch Brass

Product Description

The PARKER 4-6 FBZ-B is a straight compression tube connector designed to join compression tubing to a male NPT threaded port in a single inline fitting. Built from brass conforming to ASTM-B-453 and ASTM-B16 standards, this fitting handles up to 3500 psi working pressure, making it suitable for hydraulic, pneumatic, and fluid-handling lines in HVAC, plumbing, and industrial service applications. The compression-to-MNPT configuration allows a technician to transition from soft copper or brass tubing directly into a threaded port without soldering or brazing. At 1.51 inches overall length and 0.1 pounds, it is a compact, field-ready fitting stocked for single-unit installation needs.

This fitting is used in residential and light commercial mechanical systems where a reliable, leak-resistant connection between compression tubing and a male pipe thread is required. Typical applications include refrigerant line accessories, water supply connections, instrumentation lines, and control tubing runs. HVAC technicians, plumbers, and pipefitters commonly install this fitting when transitioning tubing into valve bodies, gauges, or threaded manifold ports. The straight body geometry makes it well suited to inline runs with no directional change required.

Key Features

• Compression x MNPT end connections allow direct tubing-to-pipe-thread transition without soldering
• 3500 psi maximum working pressure rated for demanding hydraulic and pneumatic service
• Brass construction meets ASTM-B-453 and ASTM-B16 material standards
• Straight fitting shape supports clean inline installations
• 3/8 inch thread size with MPT thread standard
• Compact overall length of 1.51 inches for use in tight installations

Compatibility

Designed as an OEM-style compression-to-MNPT brass fitting for use in residential and commercial fluid and gas handling systems requiring a 3/8 inch male pipe thread connection. Cross-references to Swagelok part number B-400-1-6.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipefitter following applicable local codes and IFGC or IPC requirements. Shut off and depressurize the system fully before removing or installing any compression fitting. Use a calibrated torque wrench and follow the fitting manufacturer's ferrule-seating procedure — do not over-tighten, as brass compression fittings can deform the ferrule and cause leaks. Inspect the tubing end for squareness and deburr before inserting into the compression nut.