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Anyone have any experience with this device? Didn't even know it existed until I found this late manual. Cheers.
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I agree:Looks like a simple on/off valve to me.
Not sure if its usage unless using an over balanced first stage or if set super finely with a first stage that swings wildly.
It's primary use is cold water diving where a 2nd Stage free flow can lead to the barrel freezing over and then the free flow cannot be stopped. Putting one on each second stage reduces the risk.