Midland Industries 18204 Brass Compression Adapter

Product Description

The MIDLAND INDUSTRIES 18204 is a brass male adapter fitting that transitions a 7/16-inch compression connection to a 3/8-inch Male NPTF threaded end. It is rated for 200 psi working pressure and a temperature range of -65 to 250 degrees F, making it suitable for a wide range of fluid and gas line applications. The fitting uses a 5/8-24 compression thread on one end and a 3/8-18 NPTF thread on the other, with a 0.68-inch hex for wrench engagement. Licensed plumbers, HVAC technicians, and mechanical contractors install this type of fitting when connecting copper, aluminum, or thermoplastic tubing to NPT-threaded system components.

This adapter is used in residential and light commercial plumbing, HVAC refrigerant and process lines, and pneumatic or hydraulic systems where a compression-to-male NPTF transition is required. It is compatible with copper, aluminum, and thermoplastic tubing and is suited for installations where a leak-free, tool-assisted compression seal is preferred over soldered or pressed connections. The center-to-end dimension of 1.1 inches allows it to fit into tight installations without additional clearance concerns.

Key Features

• 7/16-inch compression inlet to 3/8-inch Male NPTF outlet transition
• 200 psi working pressure rating
• Operating temperature range of -65 to 250 degrees F
• 5/8-24 x 3/8-18 thread specification for precise fitment
• 0.68-inch hex flat for standard wrench installation
• Compatible with copper, aluminum, and thermoplastic tubing

Compatibility

Designed for use with copper, aluminum, and thermoplastic tubing requiring a 7/16-inch compression to 3/8-inch Male NPTF connection in plumbing, HVAC, or light mechanical system applications.

Installation Notes

This fitting is installed by licensed plumbers or HVAC technicians and should be installed per IPC and applicable local codes. Shut off and depressurize the line before installation. Use a wrench on the hex flat to tighten the compression nut - do not overtighten, as brass compression fittings can crack or distort the ferrule seat. Inspect the tubing end for burrs or deformation before seating the compression sleeve.