This part is a Base Mounting Bracket, Pump, LX, Sundance, Jacuzzi, 56 Frame found in some Sundance or Jacuzzi Hot Tubs.
For the pumps that are used with this bracket click these links:
56Fr Jacuzzi® Sundance Intertek Baseless Pump 2" X 2" 2 Speed 230V WUA400II 6500-367
56Fr Jacuzzi® Sundance Intertek Baseless Pump 2" X 2" 1 Speed 230V WUA400II 6500-352 6500-363
