Midland Industries 640604C Reducing Union Push-to-connect

Product Description

The MIDLAND INDUSTRIES 640604C is a reducing union fitting designed to join two push-to-connect lines of different diameters without tools or thread sealant. The 640604C transitions from a 3/8-inch push-to-connect port on one end to a 1/4-inch push-to-connect port on the other, providing a secure, leak-resistant connection in compressed air and pneumatic tubing systems. The composite body construction meets D.O.T. standards, making it suitable for mobile equipment, air brake, and industrial pneumatic applications. Rated to 145 psi and operable from -40 to 140 degrees F, this fitting handles a wide range of service environments encountered by HVAC, plumbing, and industrial technicians.

The 640604C is used in residential and commercial pneumatic plumbing systems where a reduction in tubing diameter is required at a junction point. It is a common component in compressed air distribution lines, air brake circuits on DOT-regulated vehicles, and fluid control systems using push-to-connect tubing. Its compact footprint, measuring 1.6 inches in length and 0.7 inches in height, allows installation in tight spaces. Technicians in HVAC, plumbing, and fleet maintenance regularly use this style of fitting to simplify repairs and modifications without soldering or compression tools.

Key Features

• Reduces from 3/8-inch push-to-connect to 1/4-inch push-to-connect in a single inline fitting
• Composite body construction meets D.O.T. requirements for air brake and pneumatic systems
• Rated to 145 psi operating pressure
• Temperature range of -40 to 140 degrees F for broad service compatibility
• Tool-free push-to-connect installation on both ends
• Compact body: 1.6 inches long, 0.65 inches wide, 0.7 inches tall

Compatibility

Designed as a D.O.T.-compliant composite body push-to-connect reducing union suitable for use with standard push-to-connect tubing systems operating within the rated pressure and temperature limits.

Installation Notes

Installation is performed by qualified technicians working on pneumatic or air brake systems. Before servicing any line, depressurize the system completely and verify zero residual pressure. Insert tubing fully into each port until it seats against the internal collet to ensure a secure, leak-free connection. Verify the connection meets applicable DOT or local codes before returning the system to service.