Spa Builders LX-10/LX-05 series Topside Control. 4 Button 6' (Peanut) Alpha Rev 5.31 Size 4 1/4" x 2 1/2".
Tech Note 1: Look on the circuit board for the Revision Number, if it is Rev 5.31 or Higher, then this topside control will work without replacing the Eprom
Tech Note 2: Look on the circuit board for the Revision Number, if it is Rev 1.23 or Rev 1.31, then this topside control will work but you will need to replace the Eprom (Order 3-60-1052 In Related Items)
Special Notes: (If you are replacing Topside Number 3-00-0077 that works with Circuit Board Rev 2.51 you will be sent 3-00-0139, you will also need to order the upgrade circuit board Eprom in Related Items 3-60-1087 or the topside will not function properly.