Description: Heavy duty cast stainless steel material, surface polishing Center circle diameter: 23mm/0.9 inch; Excircle diamete: 45mm/1.8 inch; Bottom circle diameter: 15mm/0.6 inch Complete with mounting gasket and stainless steel mesh spark arrestor For use with 5/8" inside diameter hose Flush Mount Design, 90 Degree For marine, caravan, truck, automotive applications Package Includes: 1 Piece Boat Tank Vent