303 Stainless Steel Window Flow Sights are primarily used in low pressure oil lines. The air-tight glass sight allows visual observation of the liquid flow, clarity, and condition. There are no restrictions on the inside of the sight, resulting in the full flow of liquid, equal to the respective pipe size. The unit can be installed in any position (horizontally, vertically, or at an angle).","The body of the flow sight is 303 stainless steel. The glass sight has a pressure tight, solid gasket design with Viton seals. The unit tolerates temperatures up to 225° F. The maximum recommended pressure is 125 PSI. The port diameter is 37\/64. The total height is 2 7\/8 and the hex size is 15\/16. The viewable area of the glass sight is 1 3\/8 in length.