The Pro-Clarity Circulation Pump Cartridge is used on 2015 and later J 585 and J-575 Jacuzzi Models on the circulation pump side. This Pro-Clarity Circulation Pump Cartridge is used on 2012 J-495, J-425, and J-415 Jacuzzi Models. This Pro-Clarity Circulation Pump Cartridge is used on 2013 and later 400 series Jacuzzi spas on the circulation pump side