LX Whirlpool LP / WP 300 spa pump Premium Impeller - 3.0hp - PPO

LX Whirlpool LP 300 and WP300 3.0hp pump replacement impeller 

118mm diameter, 11mm vane width x 7 vanes 
60.5mm throat OD
Marked B351-21

Previous version - 
Outside diameter 118mm, 12.5mm internal vane width, 6 vanes. 
62mm throat OD 
Often marked B358-02 (but so are other sizes)   

Manufactured from premium PPO plastic for longer life

Does not suit:
Pre 2007 LX pumps with an alternate mechanical seal 
Jacuzzi/Sundance Spa pumps despite having the same pump model numbers/markings - these are manuufacturer modified.