glossary
What is a duckbill valve?
Quick answer: A duckbill valve is the small silicone one-way flap in most pump kits that opens on suction and snaps shut between cycles. It is the cheapest part of the pump and the most common reason output mysteriously drops.
In practice
Duckbills stretch with every cycle and every wash; a worn one leaks suction invisibly. Daily pumpers should replace them every 4 to 8 weeks and keep spares in the bag. If your pump feels weaker and the flange fits, swap the duckbills before blaming your body.
In Milk First
Log any session in two taps, backdate the ones you forgot, and let the 7-day average chart answer supply questions with real numbers. Every pump files its milk into the stash automatically.
Milk First speaks this whole language for you: seshes logged in two taps, every bag on its correct clock.
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