Midland Industries 12218 Master Cylinder Adapter Brass

Product Description

The MIDLAND INDUSTRIES 12218 is a dual master cylinder adapter designed to connect brake or hydraulic lines with mismatched inverted flare fittings. One end features a 1/4-inch female inverted flare connection and the other a 5/16-inch male inverted flare connection, allowing a direct size transition between two lines. Constructed from brass, it is rated to 1200 psi and handles temperatures from -65 degrees F to 250 degrees F. The fitting seals on the hex face, providing a reliable, leak-resistant joint without the need for additional sealant. Plumbers, automotive service technicians, and hydraulic system installers use this adapter in brake line and fluid transfer applications.

This adapter is used in brake hydraulic systems, master cylinder connections, and fluid line assemblies where a 1/4-inch female inverted flare line must mate to a 5/16-inch male inverted flare port. It is suited for residential, light commercial, and automotive service environments. The compact brass construction keeps weight low at 0.06 pounds, making it easy to handle in tight underdash or engine-compartment spaces typical of master cylinder service work.

Key Features

• 1/4-inch female inverted flare inlet transitions to 5/16-inch male inverted flare outlet
• Brass construction resists corrosion in brake fluid and hydraulic fluid environments
• 1200 psi maximum working pressure
• Operating temperature range: -65 degrees F to 250 degrees F
• Seals on hex face for a clean, reliable metal-to-metal seal
• Compact form factor at 0.06 pounds for easy installation in confined spaces

Compatibility

Designed as an OEM-style replacement adapter for brake hydraulic line assemblies using inverted flare connections in master cylinder applications.

Installation Notes

Installation should be performed by a qualified technician familiar with hydraulic brake system service. Before service, depressurize the brake system and absorb any residual brake fluid to prevent contact with painted surfaces. Thread the adapter by hand first to avoid cross-threading, then tighten to the fitting manufacturer's standard for inverted flare brass connections. Verify there are no leaks by applying system pressure and inspecting the hex face seal before returning the vehicle or system to service.