Dorman 785-422D Pipe Plug

Overview of Dorman 785-422D Brass Pipe Plug

The Dorman 785-422D pipe plug is a durable brass component designed for use in various GM vehicles including Buick, Chevrolet, Oldsmobile, and Pontiac models. Engineered with coarse outside threads and a hex head drive, this pipe plug provides reliable sealing for threaded pipe openings.

• Material: Brass for corrosion resistance and durability
• Thread Type: Coarse outside threads with 16 threads per inch
• Thread Size: 1/4 inch MNPT (Male National Pipe Thread)
• Head Drive Type: Hex with 0.56 inch tool size
• Dimensions: 0.53 inch thread diameter, 0.64 inch overall length, 0.5 inch depth
• Finish: Natural brass finish without zinc coating or heat hardening
• Package includes one pipe plug

Detailed Product Description

The Dorman 785-422D pipe plug is crafted from solid brass, offering excellent resistance to corrosion and wear in automotive applications. Its coarse outside threads ensure a secure fit in SAE threaded ports, specifically sized at 1/4 inch MNPT, making it compatible with a range of GM vehicles. The hex head design allows for easy installation and removal using a standard 0.56 inch hex tool. With an overall length of 0.64 inches and a thread depth of 0.5 inches, this pipe plug is engineered to provide a tight seal in fluid or air systems.

This pipe plug is compatible with multiple Buick, Chevrolet, Oldsmobile, and Pontiac models such as the Chevrolet Camaro, Caprice, and Impala, Buick LeSabre and Century, Oldsmobile Cutlass and Delta 88, as well as Pontiac Firebird and Grand Prix. The part number 785-422D ensures precise identification for replacement or repair needs.

Common Applications and Problem Solving

• Sealing unused or damaged threaded pipe openings in engine or transmission systems
• Preventing fluid leaks in cooling or fuel lines
• Replacing worn or corroded pipe plugs in classic Buick, Chevrolet, Oldsmobile, and Pontiac vehicles
• Maintaining system pressure by securely closing off pipe ports
• Providing a reliable seal in maintenance or restoration projects

Installation Notes and Tips

• Ensure threads are clean and free of debris before installation
• Use appropriate thread sealant or tape compatible with brass and vehicle fluid systems
• Do not overtighten to avoid damaging threads or deforming the plug
• Use a 0.56 inch hex tool for proper torque application
• Verify compatibility with your specific vehicle model and engine system before installation

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The 785-422D pipe plug undergoes quality control inspections to ensure consistent performance and durability. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship. Refer to Dorman’s official documentation for complete warranty information.