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Not so puzzling if you learn to use the rear dump to vent the wing (BC) while horizontal. But to be able to use it, you must be at least horizontal. If your trim is even a little bit "head-up" the rear dump won't dumpGrajan:I have always been puzzled by this configuration. One of the reasons I went to a BP / wing was that I was sick of having to go vertical to vent my BC. With an unconstrained inflator hose on my Pioneer I can lift the hose behind my shoulder and completely vent the BC from the horizontal position - love it.