Replacing the costly regulator which is the main part of the pressure pot, you can rebuild the HAR511 regulator with this kit and save.
HY-SPEED 917-064 PCV Diaphragm Repair Kit Compatible with 2005 2006
DeVilbiss TEKNA 703536 Repair Kit for 703517 703567 703566 ProLite Spray Gun
Devilbiss TEKNA 905281 Repair Kit Prolite Spray Gun 703624 703663 905132
DeVilbiss TEKNA 702736 Repair Kit 703892 703893 703894 703895 Basecoat Spray Gun