GRACO Washer, Piston - (SKU: 171594)The GRACO 171594 Washer, Piston is a small, precision engineered component designed for use within GRACO piston pumps, such as the 10: 1 Fire Ball 425 Pump. Its material is not explicitly specified in available documentation, but it is typically made from durable, wear resistant materials suitable for high pressure lubrication systems. The washer functions as a sealing or backup element for the piston assembly, ensuring reliable operation and

The kit is compatible with pumps featuring polypropylene (PP)

but similar coupling collars are typically made from durable metals or engineered plastics for longevity and compatibility with pump fluids

Periodically check for debris or buildup that may affect measurement accuracy

and drive belt according to manufacturer recommendations

Regularly inspect and maintain the air motor and associated components

Everyday reliability for medium-duty applications

Follow GRACO’s installation instructions for proper assembly and leak prevention

Designed for use with GRACO RS airless spray guns and FRP resin spray systems

and sprayers where reliable piston movement is required

It is constructed for durability and is intended to deliver a professional-quality finish with a softer spray pattern

Monitor air supply for consistent performance

Balanced GRACO NXT® Air Motor for consistent output pressure