Graco 331093 LP Lower Pump Piston Assembly

Lower Pump Piston Assembly for LP Airless Sprayers

The Graco 331093 LP Lower Pump Piston Assembly is a genuine replacement component designed for low-pressure (LP) airless paint pump systems. It plays a key role in the lower pump section by driving material upward through the fluid pump, helping maintain consistent flow, reliable sealing, and smooth pump operation during spraying applications.

Compatible Machines

This piston assembly is used in several LP series airless sprayers. Compatibility may vary by pump configuration, but it is commonly found in the following machines:

• Airlessco 400 LP
• Airlessco 402 LP
• Airlessco 500 LP
• Airlessco 505 LP
• Airlessco 540 LP
• Airlessco 600 LP
• Airlessco 800 LP
• Airlessco 2600 LP
• Airlessco 3500 LP
• Airlessco 3650 LP
• Airlessco 4000 LP
• Airlessco Mustang Series (LP versions)

Function and Benefits

• Supports smooth fluid movement within the lower pump
• Helps maintain stable spray pressure
• Works with lower pump packings to reduce leakage
• Essential for proper priming and pump efficiency

Frequently Asked Questions