Parker 4-4 Hbz-b Brass Compression Tube Union 3500 Psi

Product Description

The PARKER 4-4 HBZ-B is a brass compression tube union designed to join two tubing runs with matching compression-style end connections. It provides a reliable, leak-resistant joint in fluid and gas distribution systems where tubing must be coupled inline without welding or soldering. Rated to 3500 psi maximum working pressure, this union is built to ASME-SB75 and ASTM-B75 brass material standards. It is sized for use in instrumentation, refrigeration, and pneumatic line work where a compact, metal-to-metal compression fitting is required. Licensed plumbers, HVAC technicians, and instrumentation fitters are the typical installers.

This union fits applications in both commercial and industrial settings where tubing runs must be extended or reconnected. It is well suited for instrument tubing, compressed air lines, and fluid control circuits where a removable, reusable compression joint is preferred over a permanent brazed connection. The compression-by-compression configuration allows field installation without special tooling beyond standard tube cutters and wrenches. This fitting is catalogued with a Swagelok-compatible reference number B-400-6 for cross-reference purposes.

Key Features

• 3500 psi maximum working pressure for high-pressure tubing circuits
• Brass construction meets ASME-SB75 and ASTM-B75 material standards
• Compression x compression end connections on both sides for tool-assisted, solder-free assembly
• Inline union configuration allows joining or rejoining two tubing segments
• Cross-references to Swagelok part number B-400-6

Compatibility

Designed as an OEM-style replacement or direct-fit compression union for brass tubing systems requiring compression-by-compression connections rated to 3500 psi. Cross-references to Swagelok part number B-400-6.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified instrumentation fitter in accordance with applicable codes. Depressurize and isolate the tubing circuit fully before disassembly or fitting installation. Ensure tubing ends are cut cleanly and deburred before seating the compression ferrules. Do not overtighten compression nuts; follow standard compression fitting assembly practice for the tubing material and diameter.