Used For RV Fresh Water System; Lockable Gravity Hatch Type; 1-1/4 Inch Barb Connection/ 1/2 Inch Air Vent; Universal Size Fits Both 4-1/4 Inch Width x 4-3/4 Inch Height And 4 Inch Width x 3 Inch Height Cutouts; 6 Inch Width x 6-1/2 Inch Height Overall Di