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SCF300/12 Philips Avent Manual breast pump
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Philips Avent Manual breast pump

SCF300/12

Why the valve keeps popping out while expressing?

Constant vacuum will make the valve being “absorbed” and will pop out of its place. Press the handle rapidly when starting to pump. Once the let down has occurred you want 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 could cause the valve to pop out due to too much pressure.

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