Polaris Booster Pump Seal / O-ring Replacement Kit POLARIS BOOSTER PUMP SEAL KIT Fits PB4-60, 3/4 hp Booster Pump with serial number M12011001 and before Kit does Not fit New models or Halycon TORK is a Registered Trademarked Brand that sells quality replacement parts you'll receive a volute oring, shaft oring, shaft seal,