Generic Screwplug Element [1" Thread, 1.5 5.5 kW, C Spa XL Coates, 115V 230V] (31521800012) aandamfg Matching the correct white twin roto Matching the correct white twin roto deluxe scale style internal helps preserve intended fit and appearance this Waterway internal is a practical replacement when a 3 3 8 inch roto deluxe scallop insert in gray is required A heating element like this is useful because it restores a specialized screw in heat component in systems that depend on this specific combination of thread style and electrical characteristics Specialty heater elements should be replaced with close attention to fit and operating specification