Parker 28-8-4 Barbed Tube Male Connector 1/4-18 Brass

Product Description

The PARKER 28-8-4 is a barbed tube male connector designed for fluid and pneumatic line connections in plumbing, HVAC, and industrial tubing applications. The fitting features multiple barbs that grip the inner wall of flexible tubing to resist pullout under pressure. Constructed from brass, the 28-8-4 offers corrosion resistance and durability in both wet and dry service environments. It connects a barbed tube end with a 0.375 inch inside diameter to a 1/4-18 male threaded port. Plumbers, HVAC technicians, and industrial pipefitters install this type of fitting when transitioning between threaded pipe ports and flexible tubing runs.

This fitting is suited for residential and light commercial applications where a reliable barb-to-male-thread transition is required. Typical use cases include connecting flexible poly or rubber tubing to threaded valve bodies, manifolds, equipment ports, and panel fittings. The 1/4-18 thread designation is a standard NPT thread size common across HVAC equipment, plumbing fixtures, and pneumatic systems, making this a frequently specified fitting in service and repair work.

Key Features

• Multiple-barb design grips tubing ID to resist pullout under pressure
• Brass construction provides corrosion resistance for wet and dry service
• 0.375 inch tube inside diameter for compatibility with standard flexible tubing
• 1/4-18 male thread for connection to standard NPT-threaded ports
• Compact, lightweight build at 0.04 pounds for easy handling and installation

Compatibility

Designed as an OEM-style replacement and service fitting for plumbing, HVAC, and pneumatic systems using 1/4-18 NPT male threaded ports with 0.375 inch ID flexible tubing connections.

Installation Notes

Installation is typically performed by licensed plumbers or HVAC technicians. Shut off all fluid or air supply and relieve system pressure before removing or installing fittings. Apply thread sealant tape or compound to the male NPT threads in accordance with applicable plumbing codes before threading into the port. When seating the tubing onto the barb, push firmly past all barb rings and secure with an appropriate clamp where required by the application or local code.