GRACO Priming Piston (6-1/2” Diameter) - (SKU: 178090)The GRACO 178090 Priming Piston is a critical component designed for use in GRACO oil and grease pumps. It is typically constructed from durable materials such as steel, brass, or aluminum, and is engineered to facilitate the priming process within the pump, ensuring efficient fluid intake and reliable operation. Key Features: Priming Piston 6 1 2 (165. 1 mm) Diameter Steel, brass, aluminum, acetal, nitrile rubber, polyurethane (wetted parts in

Used in GRACO dispensing and spray equipment for mounting handles

Easy to integrate with compatible hoses and fittings

Long battery life (2 AAA batteries)

Constructed from ultra-high molecular weight polyethylene (UHMW)

especially in high-cycle or extreme environments

Industrial and maintenance painting

Inspect bracket and mounting area for proper alignment and secure fit

Long reach for improved access

Mechanical preset dispense meter

Replace the body assembly as part of scheduled maintenance or if performance issues arise

High Output

Regularly inspect the regulator for wear or damage