Comparison : Item # CWTK-H58-250-035, Copper Water Tube - Type K
Item # CWTK-H58-375-049, Copper Water Tube - Type K
Item # CWTK-H58-500-049, Copper Water Tube - Type K
Item # CWTK-H58-625-049, Copper Water Tube - Type K
Item # CWTK-H58-750-065, Copper Water Tube - Type K