Dorman 785-422 Pipe Plug

Durable Brass Pipe Plug for GM Vehicles

The Dorman 785-422 pipe plug is a reliable hardware component designed for use in various Buick, Chevrolet, Oldsmobile, and Pontiac models. Crafted from brass with a hex head drive, this pipe plug offers a secure and corrosion-resistant seal for SAE threaded applications.

• Material: Brass for corrosion resistance and durability
• Thread Type: Coarse 1/4 inch MNPT (Male National Pipe Thread)
• Head Drive Type: Hex with 0.56 inch tool size for easy installation
• Thread Diameter: 0.53 inches with 16 threads per inch
• Overall Length: 0.64 inches, standard grade

Technical Details and Specifications

The Dorman 785-422 pipe plug features outside coarse threads designed to fit SAE 1/4 inch MNPT threaded ports. Its brass construction provides natural resistance to rust and corrosion, making it suitable for sealing fluid or air passages in automotive systems. The hex head drive allows for straightforward tightening or removal using common hand tools. This pipe plug is not heat hardened or zinc coated, maintaining its standard grade quality for general automotive use.

Compatible Vehicles and Applications

This pipe plug is compatible with a wide range of General Motors vehicles, including Buick models like the Century and LeSabre, Chevrolet models such as the Camaro and Caprice, Oldsmobile vehicles including the Cutlass and Delta 88, and Pontiac models like the Firebird and Grand Prix. It is ideal for use in systems requiring a 1/4 inch MNPT pipe plug, commonly found in engine, transmission, and cooling system components.

• Sealing unused threaded ports in engine blocks or cylinder heads
• Preventing fluid leaks in cooling or fuel systems
• Replacing worn or damaged pipe plugs in GM vehicles
• Maintaining pressure integrity in hydraulic or pneumatic lines
• Ensuring proper sealing in exhaust or emission control systems

Installation Notes and Tips

Before installation, ensure the threaded port is clean and free of debris. Apply an appropriate thread sealant or Teflon tape to the pipe plug threads to enhance sealing performance. Use a 0.56 inch hex wrench or socket to tighten the plug securely without over-torquing, which could damage the threads or the plug. This part is designed for SAE coarse threads and should be installed accordingly.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 785-422 pipe plug undergoes quality inspections to ensure thread accuracy and material integrity. While specific warranty details may vary, Dorman typically offers limited warranties covering defects in material and workmanship to provide confidence in product reliability.