NAPCO Rotary Gear Pumps come installed with one .016 chamber gasket on the drive side bearing housing/side cover and three .008 inch chamber gaskets on the non-drive side bearing housing/side cover. Efficiency can be improved where operation wear has occurred by removing one of the three .008 inch non-drive side gaskets to tighten clearances and restore operational efficiency. UNLESS ESPECIALLY MODIFIED, NAPCO PUMPS LEAVE THE FACTORY WITH APPROXIMATELY A .008 INCH COMBINED CLEARANCE BETWEEN THE ENDS OF THE GEARS AND ADJACENT BEARING HOUSING SURFACES. High temperature, or other unusual operating conditions, may dictate some variance in gear/housing clearances.
Gear Pumps 
Maintenance Gaskets
Maintenance Gaskets