This motor is designed to use with Hayward HeatPro heat pump models Hayward HeatPro heat pump models HP2100, HP2100TCO, HP1100, HP600, HPABGDELUXE. 1/3 house power. Use part HPX1103113435 on units HP380 and HPAB built prior to S/N 21120501007121001. Weighs 16-pound.