GRACO Stem, Piston (189355) - (SKU: 189355)The GRACO 189355 Stem, Piston is a replacement part designed for use in GRACO spray gun assemblies. Its material is not explicitly specified in available documentation, but it is engineered for durability and reliable operation within GRACO equipment. The part functions as a critical component in the piston assembly, enabling precise fluid control and actuation in automatic electrostatic air spray guns. Key Features: Stem, Piston Fits GRACO PRO Auto

Industrial fluid transfer in chemical

providing vibration resistance and preventing loosening under operational stress

Regularly inspect the plunger spring for signs of wear or fatigue

and applications requiring reliable pumping of liquids with small solids[2][3][5]

Suitable for both large and small jobs where operator comfort and finish quality are important

Used for repairing or replacing the clutch field assembly in GRACO equipment

Use only GRACO-recommended lubricants or sealants if required

Install optional high-pressure and low-level switches for system protection if required

Follow all safety guidelines for installation and operation

but it is intended for use in electrical circuits to ensure proper power distribution and lighting functionality in compatible GRACO systems

Ensures proper alignment in pump assembly

and maintenance applications where controlled distribution of fluids is required