exposed version shows follower plate:
RoughneckŪ Air-Operated 50:1 Mobile Grease Pump Kit — For 33–66-Lb. Drums
Reg. $379.99
Sale $349.99
Double action 115 PSI grease pump is easy to operate and maintain
For use with 33–66-lb. drums
Drum cover prevents impurities from contaminating grease and keeps pump in vertical position
Follower plate is pulled toward bottom of drum by pump vacuum for effective pumping of heavy grease