Midland Industries 28683 Lincoln Interchange Male Coupler

Product Description

The MIDLAND INDUSTRIES 28683 is a Lincoln Interchange male coupler designed for pneumatic systems. It connects 1/4 in male iron pipe (MIP) on both ends and is machined from brass for reliable performance in compressed-air service. The 1/4-18 thread specification ensures a standard, secure fit at both connection points. Rated for a maximum operating pressure of 250 psi, this coupler handles typical shop-air and light industrial pneumatic line pressures without issue. HVAC technicians, plumbers, and general trades installers use Lincoln Interchange fittings to quickly connect and disconnect pneumatic tools and air lines in a variety of service environments.

This coupler fits pneumatic systems using the Lincoln Interchange standard, one of the most widely adopted quick-connect coupling series in North American trade and industrial applications. It is suited for residential and light commercial settings where compressed-air tools, pneumatic controls, or air-line distribution requires a reliable male coupler at a 1/4 in MIP port. The brass construction makes it appropriate for dry-air and low-moisture pneumatic service.

Key Features

• Lincoln Interchange series male coupler - compatible with the widely used Lincoln Interchange coupling standard
• Dual 1/4 in MIP connections with 1/4-18 thread on both ends
• Brass construction for corrosion resistance in compressed-air service
• 250 psi maximum operating pressure rating
• Compact profile: approximately 2.65 inches in length and 0.9 inches in width

Compatibility

Designed as an OEM-style replacement or add-on fitting for pneumatic systems using Lincoln Interchange series couplers with 1/4 in MIP port connections.

Installation Notes

Installation is typically performed by a licensed plumber, HVAC technician, or qualified trades professional familiar with compressed-air line work. Depressurize and isolate the air line completely before removing or installing any fitting. Apply thread sealant appropriate for pneumatic service to the MIP threads before making up the connection - do not use sealant on the first one or two threads. Verify the system does not exceed the 250 psi maximum rated pressure after returning to service.