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Based on the same "sliding shoe" design as Lexair's original units, this series features many operational and safety enhancements including the patented sequenced mechanical lock/indicator assembly. This device provides an external visual indication of the valve's position. When in the "door close" and locked position, the indicator is retracted. Shifting the valve to the "door open" or unlocked position causes the indicator to be extended. The patented "integral safety check" option is also available (at no extra cost), which is very useful in preventing unwanted inadvertent actuation of the door operating system, the company says.