Static Pressure Probe Aspiration Insertion Length 5 1/2 In Exterior Length 1 3/4 In Overall Length 7.25 In 4 Hole Flange Dia 1 1/2 In Mounting Hole Dia 3/16 In Mounting Hole Center to Center 1 In Fitting Size 1/4 For Use With Air Pressure Sensing Switches Includes Metal Barbed Hose Adapter