The Caretaker 4-1-2003 is a complete union. In the year 2010, the manufacture of Caretaker In Floor System introduced the upgraded Caretaker water valve. The two changes that were made to the new style Caretaker valve were the valves outlets now are 2 inches, versus the original style only being 1.5 inch. The Unions that come with the new style have a different thread pattern.