Cummins 3678724 Water Pump O-Ring Seal – ISX QSX15

Keep your Cummins cooling system sealed and operating properly with the Cummins 3678724 Water Pump O-Ring Seal. This O-ring is designed to provide a secure, leak-resistant seal between the water pump and engine block.

A worn, damaged, or flattened O-ring can contribute to coolant leaks during water pump service. Replacing the seal during installation helps ensure a proper fit and dependable sealing performance.

Features & Benefits:
• Cummins part number 3678724
• Water pump-to-engine block O-ring seal
• Helps prevent coolant leaks
• Used in Cummins ISX and QSX15 engine applications
• Ideal for water pump replacement or repair
• Compact, easy-to-store service part
• Genuine Cummins and aftermarket replacement options available

Part Number: 3678724
Product Type: Water Pump O-Ring / Coolant Seal
Engine Applications: Cummins ISX / QSX Series, including certain QSX15 applications
Cross References: Neapco 121316, PAI CUP121316

Important Fitment Note:
Please verify fitment by Cummins engine serial number before ordering. Part applications can vary by engine configuration and water pump design.