5th port allows for a hose routing options that can be advantageous when mounting the first stage to twin cylinders.
Heat exchanger helps resist freezing in cold water.
Material: High polished chrome plating over marine brass
This kit cannot be retrofitted to any of the old XTX first stages, it can only be fit to new XTX200 and XTX100 first stages which use the metal decal. This is specified in the kit instructions.