Graco lube and Air is a package of additional pump mounting accesiories that includes a Filter, Regulator, Lubricator, and a gauge. This product is designed to maintain the smooth operation of the pump and provide the PSI value the pump is currently operating at. 

Functions:

• Regulator maintains constant pressure inside the pumps of 110 PSI, which can be observed with the Gauge.
• Filters are used on the air being pulled in to the pump in order to draw out and remove any water that is present. 
• Lubricator provides lubrication in the pump to help maintain smooth motion, and limit wear on parts.