Graco 16U421 Collar Coupling Rod for Pump

Compatible Machines

This part is used in industrial Graco pump systems. It is commonly found in heavy-duty displacement and Big Rig pump assemblies.

• Graco GH Series Big Rig Pump Systems
• Industrial Displacement Pump Assemblies (332158 Series)
• Heavy-Duty Roofing and Coatings Pump Units

Graco 16U421 Collar Coupling Rod for Pump

The Graco 16U421 Collar Coupling Rod for Pump is an OEM internal pump component that ensures precise coupling between the pump rod and drive mechanism. It maintains pump alignment, supports smooth motion transfer, and helps ensure reliable operation within industrial-grade pumping systems.

Product Features

• OEM internal pump component
• Maintains precise alignment in the pump drive system
• Designed for industrial displacement and Big Rig pump assemblies
• Durable construction for long pump life

Technical Information

When to Replace

• Rod-to-drive connection shows excessive play or misalignment
• Pump stroke becomes inconsistent or noisy
• Visible wear on coupling components during pump service

Why This Part Is Important

This collar coupling rod is critical to maintain smooth and aligned internal pump motion. If worn or damaged, the pump may lose efficiency, produce vibration, or sustain further internal wear. Replacing the coupling rod restores stable pump operation and helps avoid costly downtime in industrial spraying tasks.

Frequently Asked Questions