Caldera Spas, Etc Stainless steel, 5.5kW/230v vertical replacement heater assembly. 3/4" barb x 3/4" 90° barb with a pressure switch tap. Made for use on Caldera Spas and others. Pressure switch no included. Note: Please pay attention to the direction of the 90° barb end when ordering. The two holes 180° from the terminals are external thermowells.