Övre lock

These are lifesavers when you're pumping at work and realize you forgot a part at home. They fit securely and clean up easily, so I always keep this spare set in my pump bag now.

Kept one in my pump bag and one at home so I'm never stuck without a spare mid-session. They fit snugly and haven't warped after a month of daily hot-water washes, though I wish they came in a two-pack for the price.