UV upgrade kit for all pre-2011 UV units. Includes UV-kill 4-pin lamp and 4-pin solid state transformer. This kit will fit all EWS under counter filtration with UV option and EWS reverse osmosis systems with UV option.
What is the difference between the pre-2011 2-pin UV assembly and the new post-2011 4-pin UV assembly? Just a slight upgrade in quality and improvement in a new solid state transformer.