
There is a rubber seal that is sure to get lost if you pump milk on the go or clean it in the dishwasher. Not clear or transparent like the Boon Nursh adapter that fits Comotomo bottles without a seal. Feels like plastic is cheaper than Boon Nursh. The worst thing is that it doesn't seem to be returnable - Boon Nursh can be returned if it hasn't been used. So if like me you want to see if it fits your Pump and Komoto bottles, buy Boon Nursh first.

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