The AP-4 System is discontinued. The recommended direct replacement is: Hydro-Quip - Control System, Air, HydroQuip CS6009US1 Slide , Conv. 1.4/5.5kW, Pump1, Blower or P2, Light, w/ Time Clock, w/ Molded (J&J Style) Cords - CS6009-US1

If you are looking update your system to an electronic system that has option for wifi controls, we recommend: Balboa® - BP7 4.0 KW Control Box Bundle With TP700 Topside Control - 50-BP7-700-40-K

Spa Builders - AP-4 Control, 240V,  5.5KW Heater & Time Clock - 3-70-0469

240V, 4 Wire Ready

Operates:

Pump 1 - 240V, 2-Speed

Pump 2 - 240V, 1-Speed 

Blower - 120V, 1-Speed 

Ozone - 120V 

Light - 12V 

Cords - Pump 1, Pump 2, Blower, Ozone 

Topside Not Included, Recommend: AI 932449-120 Len Gordon 4 Button Digital Topside

Replacement option for the following older units: 

• 3-70-0425 Difference is smaller box, length of heater is 12” and does not have built in GFCI
• 3-70-0153 Only difference is the receptacles, and the receptacle for the ozone.  The 3-70-0469 comes with 4pin amp plugs and the 3-70-0153 comes with a 3pin amp plug for the ozone, and MJJ plugs for the other receptacles, so the plug on your ozonator will need to be changed. USE: 350547-1 and 35-0003, or complete cord: 30-0324-96
  
• This unit has AMP Plugs. If your old unit used the MJJ Plugs, you can use this adapter set: Hydro Quip - Adapter Cord Kit, P1/2-spd, P2/1-spd, Blwr, Oz (4 cords) - CORDKIT