HydroQuip/Balboa Eco 401(Lite Duplex) Spaside Control This topside control is made for use on Hydro-Quip Platinum Series 6501B and 6502B systems. It will also work on Balboa VS500Z and VS501Z systems. It has a 7ft cord with an 8 wire phone jack style plug and comes with an overlay. Buttons layout is: Blower, Jets, Temp, Light. LCD display.