Midland Industries 20243 Brass Union 5/16 in Tube Od

Product Description

The MIDLAND INDUSTRIES 20243 is a brass flareless union fitting designed to join two lengths of tubing at the same outside diameter. It creates a secure, leak-resistant connection in low-pressure fluid and gas lines without requiring flared tube ends. The fitting accepts 5/16 in tube OD on both sides and is rated for pressures up to 150 psi across a temperature range of -40 to 150 degrees F. At 0.040 pounds, it is compact and lightweight, measuring 0.69 inches in length with a 7/16-24 thread and a 0.44 in hex for standard wrench engagement. Licensed plumbers, HVAC technicians, and refrigeration mechanics are the typical installers.

This union is suited for use in residential and light commercial applications where aluminum or copper tubing carries refrigerant, fuel gas, hydraulic fluid, or instrumentation lines. The flareless design is common in OEM equipment installations and field-service repairs where tube preparation time is a factor. It is especially useful in tight spaces where a compact union fitting simplifies a straight-run splice or a line repair.

Key Features

• Flareless union design - no tube flaring required for installation
• Rated to 150 psi working pressure
• Temperature range: -40 to 150 degrees F
• 7/16-24 thread with 0.44 in hex for standard wrench fit
• Compatible with aluminum and copper tubing
• Brass construction for corrosion resistance and durability

Compatibility

Designed for use with aluminum and copper tubing at 5/16 in outside diameter. Suitable for flareless tube fitting systems in refrigeration, fuel, and instrumentation line applications.

Installation Notes

Installation should be performed by a qualified plumber, HVAC technician, or refrigeration mechanic. Shut off and depressurize the line before disassembly or fitting installation. Use a properly sized open-end or combination wrench on the 0.44 in hex - do not use pipe wrenches or adjustable pliers, which can distort the fitting body. Verify tube ends are cut clean, deburred, and fully seated before torquing the nut.