This pump has two hose connections, air out and air in. Air in for deflating every last bit of air, making it useful as a decent manual vacuum pump.
The only downside is that on my unit, on the down-stroke the internal valve does not reverse until half way down, thus giving 1 and 1/2 air pumps per push-pull cycle.
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Product Description:
High-volume air flow on both up anddown strokes Rugged non-corrosive plastic construction Footplate for easy pumping Non-kink inflating hose valve adapter Four nozzles Inflates or deflates Doubles as a bilge pump
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