Question

Why does the valve keep popping out while expressing?

Answer

A constant vacuum will make the valve being "absorbed" pop out of its place. Press the handle rapidly when starting to pump. Once the let down has occurred, you need to slow down and hold the handle for 2-3 seconds and then release the handle all the way up. When releasing the handle half way it will continue to build pressure inside the pump and this could cause the valve to pop out due to too much pressure.

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