Used For RV Fresh Water System; Lockable Gravity Hatch Type; 1/2 Inch Male Pipe Thread/ 1-1/4 Inch Barb Connection/ 1/2 Inch Air Vent; For 5-7/8 Inch Width x 4-3/4 Inch Height Cutout; 7-5/8 Inch Width x 6-1/2 Inch Height Overall Dimensions; Without Check