Balboa VS501Z Circuit Board, 54357 Balboa circuit board for the VS501Z spa controller model. Chip Number VS501ZR2D. OEM part number for circuit board is 54357-03. SpaGuts P/N: 10-175-3005 Circuit Board dimension (Approx): 11 inch x 5 inch. Board Features: Pump 1 dual speed, Blower/Pump 2 single speed, Ozone, Circ Pump This circuit board is also the replacement option for the following Balboa Circuit Boards or Systems (NOTE: If using as a replacement board for a Viking Spa or other Spas, make sure the pumps are rated NO MORE than 230V 12A): 54585 (System), 55191, 55035-01 (System), 55036-01 (Chip VS240RR2C), 55228, 53268, 53267 (System), 55371, Chip VS501ZR1B, Chip VS501ZR2B, Chip VS501ZR2C, Chip VS501ZR2D, 54356 (System), 54293-02 (SYSTEM MAAX 167 VS501Z), 54294-01 (BOARD MAAX 167 VS501Z), Chip 167R1B, 56075- This circuit board is compatible with the following Balboa Topside Panels: 52144, 51676, 51223, 51248, 54094 This item comes with a 1-year manufacturer's limited warranty from the original purchased date. FREE GROUND SHIPPING TO THE 48 US CONTINENTAL STATES.