Graco 188178 Piston Seal 12:1

Graco 188178 Piston Seal 121 – OEM Fluid Seal Component

Compatible Machines

• Graco high-pressure spray pumps
• Graco industrial fluid systems
• Graco professional application equipment

The Graco 188178 Piston Seal 121 is a genuine OEM replacement seal designed to maintain fluid containment and preserve pressure stability in compatible piston pump systems.

Key Features

• OEM quality seal
• Maintains consistent pressure
• Prevents internal bypass
• Durable for heavy use

Installation & Usage Tips

• Clean mating surfaces before install.
• Apply light lubricant to aid seating.
• Inspect surrounding components.
• Pressure test after install.

Frequently Asked Questions