Elring 778.200 Engine Coolant Pipe Seal

Engine Coolant Pipe Seal for GM Trucks and Vans

Elring 778.200 is an engine coolant pipe seal built as an O-ring for lower, water pump, and lower coolant pipe sealing locations. With a 33 mm inner diameter and 2.5 mm thickness, it supports a precise seal where coolant passages need reliable compression and leak control.

Compatible with Chevrolet Express 2500, Chevrolet Silverado 2500 HD, GMC Savana 2500, and GMC Sierra 2500 HD applications across the listed model years, this seal is also used on Chevrolet Silverado 3500 HD and GMC Sierra 3500 HD fitments. The Elring 778.200 part number is a direct reference for buyers searching by OE-style coolant sealing dimensions.

Key Features

• Engine coolant pipe seal in O-ring shape
• 33 mm inner diameter for the specified coolant sealing interface
• 2.5 mm thickness for proper sealing compression
• Fitting positions include lower, water pump, and lower water pump locations
• Elring 778.200 for catalog and cross-reference lookup

Detailed Description

Elring 778.200 is a sealing component for coolant system service where the pipe-to-housing interface must remain sealed under heat and pressure. Its O-ring design and measured dimensions help maintain a tight seal at the water pump and lower coolant pipe connection points. This part is listed for Chevrolet Express 2500, Chevrolet Express 3500, Chevrolet Silverado 2500 HD, Chevrolet Silverado 3500 HD, GMC Savana 2500, GMC Savana 3500, GMC Sierra 2500 HD, and GMC Sierra 3500 HD applications, along with related Classic and Silverado/Sierra 3500 coverage shown in the fitment data.

This part cross-references OE-style numbers 16022700 and 94011603 for the same application.

Common Issues This Seal Can Address

• Coolant seepage at the water pump sealing surface
• Leakage from the lower coolant pipe connection
• Loss of coolant from a worn or flattened O-ring
• Service issues after coolant pipe or pump removal
• Seal deterioration from age, heat cycling, or coolant exposure

Installation Notes and Tips

Clean the sealing groove and mating surfaces before installation. Inspect the coolant pipe, water pump housing, and surrounding surfaces for corrosion, nicks, or residue that can affect sealing. Apply the seal only in the specified fitting position and verify correct seating before refilling the cooling system. After installation, check for leaks at operating temperature.

Quality Assurance

Elring supplies sealing components for engine service applications, including gaskets, O-rings, and coolant system seals. Part number 778.200 is specified by measured dimensions and fitment data to support accurate replacement selection for GM truck and van cooling system repairs.