The product description describes the release valve as an easy-to-use button. However, the release valve is a screw, making it difficult to operate with one hand. Not such a big deal, except that I bought it on purpose because the photos showed a push button exhaust valve. Another problem with this product is that once you pressurize the bag to a certain point, the tubing that goes to the pump bulb ruptures and you lose all of the pressure. I strongly advise against purchasing this product.
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