Midland Industries 00066-0302 Brass Compression Adapter

Product Description

The MIDLAND INDUSTRIES 00066-0302 is a brass female adapter fitting designed to connect a 3/16-inch compression tube to a 1/8-inch female NPT (FNPTF) threaded port. Built from solid brass, this adapter handles system pressures up to 400 psi and operates across a temperature range of -65 to 250 degrees F, making it suitable for a wide range of fluid and gas line applications. The hex body measures 0.56 inches across flats for standard wrench engagement. Licensed plumbers, HVAC technicians, and refrigeration mechanics regularly use this type of adapter when transitioning from soft tubing runs to threaded fittings at equipment or manifold connections.

This adapter is suited for residential and light commercial installations where copper, aluminum, or thermoplastic tubing must terminate at a female NPT port. Typical use cases include instrument lines, fuel lines, refrigerant accessory lines, and control tubing connections. The compression end accepts 3/16-inch OD tubing without soldering or flaring, while the FNPTF end threads onto a male NPT fitting or port. The center-to-end dimension of 0.78 inches helps when planning clearance in tight installations.

Key Features

• 3/16-inch compression inlet connects to 1/8-inch FNPTF threaded outlet
• Rated to 400 psi working pressure
• Temperature range of -65 to 250 degrees F
• Compatible with copper, aluminum, and thermoplastic tubing
• 0.56-inch hex for wrench tightening without tube distortion
• No soldering or flaring required at the compression end

Compatibility

Designed for use with copper, aluminum, and thermoplastic tubing in compression fitting systems terminating at a 1/8-inch female NPT port.

Installation Notes

Installation should be performed by a licensed plumber or qualified HVAC or refrigeration technician in accordance with applicable local codes. Shut off and depressurize the system completely before making or breaking any fitting connections. Hand-tighten the compression nut onto the tubing, then snug with a wrench - do not overtighten, as brass compression fittings can crack or deform under excess torque. Apply thread sealant or PTFE tape to the FNPTF threads as required by the application and local code.