Quick Acting Line Blinds

"Quick Acting Line Blinds are designed for applications where positive, visual indication of line closure/opening are required.
The position of the spectacle plate indicates whether the line is open or closed, reducing or eliminating the possibility of costly or dangerous situations. Quick Acting Line Blinds utilize O-ring seals to achieve the most effective shutoff. Our standard O-ring is located in a dovetail groove in both faces of the spectacle plate.Two stainless steel guide pins are located in the face of the body flange to ensure accurate alignment of the spectacle plate with the bore."