4 inch tank openings reduced to 2 1/2" x # 8 NPT female Thread and INCLUDES o-ring ( for 4" side of adapter to tank ).
The 4" MPT fitting screws into tanks with 4" female opening, and allows the use of a smaller valve ( one with 2 1/2" male threads ) to be used.Allows use of standard valves to be used on commercial size tanks.Tank Reducing Bushing 4 x 2.5 inch Adapter CH4821-2 made by Structural
