This Plews Continuous Flow Air Operated Grease Gun connects to your air compression system to generate a continuous flow of grease.All you need to do is pull the trigger to get up to 3600 PSI without manually pumping as required by hand operated grease guns.Features Works with a compressed air system Gives continuous output with minimal effort No manual pumping Specifications 40:1 Pump Ratio 3600 PSI Head Cap Port Application: Grease Guns