Window Flow Sights with Ball Indicator have an air-tight glass sight that allows visual observation of liquid flow, clarity, and condition. A nylon ball indicator shows the direction of fluid movement.","The body is plated steel. The glass sight has a pressure tight, solid gasket design with Viton seals. This flow sight features a 3\/8 diameter off-white nylon ball to visually indicate fluid movement. The flow of fluid will position the ball toward the outlet.","The unit can be installed in any position (horizontally, vertically, or at an angle).","It tolerates temperatures up to 180° F. The maximum recommended pressure is 125 PSI. The total height is 3 and the hex size is 13\/16. The visible area of the glass sight is 1 1\/16 in length.","NOTE: This image is a general illustration of a window flow sight with ball indicator. It is not an exact representation of the part described on this page.