This is the WAV starter Kit. With 2 WAV powerhead and 1 Link module with power supply. I have this unit running for 1.5 years. Changed to GHL and Tunze powerhead so I am letting this go. I just finished a vinegar bath and had a good brush on them. Awesome and seamless integration powerhead for APEX, and they move tons of water! $375 shipped. Paypal friends and family.