Adjust pump RPM to increase efficiency by changing the pump pully diameter to adjust for short and long tracks. Larger pump pullies will slow the pump down for higher speed tracks. Could be used on any pump with an 8mm shaft. For standard o-ring belts. Includes setscrew. Fits 8mm pump shafts.
O-ring belts available separately in BUNA RUBBER, SILICONE RUBBER, TWISTED URETHANE
