Graco 16U801 Stop Upper Ball

Graco 16U801 Stop, Upper Ball Component

Compatible Machines

The following Graco pump lowers and equipment assemblies list part 16U801 Stop, Upper Ball in their component breakdowns:

• Units with pump lower assemblies referenced in service manual “3A3109.”
• Units with pump lowers listed in manual “3A3110.”
• Industrial and mortar pump configurations documented in manual “3A5275.”
• Older piston pump assemblies listed in “332649A” parts breakdown.

Product Overview

The Graco 16U801 Stop, Upper Ball is a precision valve component used inside pump lower assemblies to regulate one-way fluid flow. It plays a key role in maintaining consistent pumping pressure and preventing material backflow during coating, spraying, or general high-pressure fluid transfer applications.

Key Features

• High-strength, corrosion-resistant metal construction for demanding environments.
• Engineered sealing surface for precise fluid control.
• Designed for long-term durability in heavy-duty pumping systems.
• Suitable for high-pressure industrial, coating, and spray applications.

Material & Durability

• Manufactured for high resistance to abrasion and chemical wear.
• Supports continuous operation in professional spray and mortar systems.

Installation Notes

1. Ensure full system depressurization before opening the pump lower.
2. Disassemble the pump lower following your equipment’s service manual.
3. Install the new stop ball in the correct seat orientation.
4. Reassemble, tighten to specified torque values, and test for proper sealing.

Frequently Asked Questions