Midland Industries 18156 Brass Compression Adapter

Product Description

The MIDLAND INDUSTRIES 18156 is a brass female adapter fitting that connects 3/8-inch compression tubing to a 3/4-inch female NPT (FNPTF) threaded port. Brass construction provides reliable corrosion resistance and durability in a wide range of plumbing and fluid-handling applications. The fitting is rated for 200 psi and a temperature range of -65 to 250 degrees F, making it suitable for both hot and cold service lines. The threaded dimensions are 9/16-24 on the compression side and 1/2-14 on the NPT side, with a 1.16-inch hex for wrench engagement. Plumbers and HVAC technicians typically install this fitting when transitioning from soft tubing runs to threaded valve or equipment connections.

This adapter is designed for use with copper, aluminum, and thermoplastic tubing, making it versatile across residential and light commercial plumbing, refrigeration, and gas-line applications where a compression-to-NPT transition is required. It is a direct-connect, field-installed fitting that requires no soldering or crimping tools, which simplifies repairs and new installations in tight spaces or retrofit scenarios.

Key Features

• 3/8-inch compression inlet to 3/4-inch FNPTF outlet transition in a single fitting
• Brass construction resists corrosion and withstands moderate system pressures
Compatible with copper, aluminum, and thermoplastic tubing types
• Rated to 200 psi operating pressure
• Wide service temperature range: -65 to 250 degrees F
• 1.16-inch hex allows standard wrench installation without special tools

Compatibility

Designed for use with copper, aluminum, and thermoplastic tubing in compression-to-FNPTF fitting applications.

Installation Notes

Installation is typically performed by a licensed plumber or HVAC technician. Shut off the water or fluid supply and depressurize the line before fitting installation. Hand-tighten the compression nut first, then apply wrench torque using the 1.16-inch hex flat to avoid overtightening the fitting body. Apply thread sealant or PTFE tape to the FNPTF threads in accordance with local plumbing codes and the applicable IPC or IFGC requirements for the service type.