Parker 4-8 Gbz-b Compression X Fnpt Brass Tube Connector

Product Description

The PARKER 4-8 GBZ-B is a straight compression tube connector designed to join tubing to female NPT threaded ports in fluid and gas distribution systems. Machined from brass to ASTM-B-453 and ASTM-B16 standards, it provides a reliable, leak-resistant connection rated to 3500 psi maximum working pressure. The fitting accepts a 1/2 inch compression end on one side and a 1/2 inch FNPT thread on the other, making it a practical adapter between compression tubing runs and threaded pipe fittings. At 0.21 pounds and an overall length of 1.67 inches, it is compact and straightforward to install in tight panel or equipment spaces. Plumbers, HVAC technicians, and industrial pipe fitters routinely use this type of fitting in instrumentation, refrigeration, and hydraulic lines.

This fitting is suited for residential and light commercial plumbing, HVAC refrigerant and control lines, pneumatic systems, and instrumentation tubing applications where a transition from compression tubing to a female NPT threaded port is required. The straight configuration keeps installation simple in inline runs. The brass construction makes it compatible with a wide range of fluid media including water, oil, and many gas services within its rated pressure range. The Swagelok cross-reference part number for this fitting is B-400-7-8.

Key Features

• Rated to 3500 psi maximum working pressure for demanding fluid and gas applications
• Brass construction meeting ASTM-B-453 and ASTM-B16 standards for material integrity
• 1/2 inch compression inlet transitions to 1/2 inch FNPT threaded outlet in a straight inline configuration
• Overall length of 1.67 inches for installation in space-constrained locations
• Lightweight at 0.21 pounds — minimal load on tubing runs and panel assemblies
• Cross-references to Swagelok part number B-400-7-8

Compatibility

Designed as a direct-fit compression-to-FNPT adapter for systems requiring a 1/2 inch compression tube connection to a 1/2 inch female NPT threaded port. Cross-references to Swagelok part number B-400-7-8.

Installation Notes

Installation should be performed by a licensed plumber, HVAC technician, or qualified pipe fitter following applicable IPC or local mechanical code requirements. Depressurize and drain or purge the system fully before disconnecting or installing any compression fitting. Compression fittings require proper tube preparation — ensure tubing is cut square and deburred before seating the ferrule. Do not overtighten; follow the fitting manufacturer's standard turn-past-finger-tight procedure for compression connections.