Be aware that there are two teleflex units that have this feature, and one has been discontinued because they break too often. The first one of these is the one with the "rock and roll" top unit. The second is the new style, which has a button, and apparently works. This is the one that is soon to be availiable. Make sure you don't get the old one, as there seems to be almost a 100% faliure rate.
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