The b.box twin pack replacement O-rings are silicone seals made for the matte lid on a b.box sippy cup. Seat an O-ring evenly in the lid rim, pressing around it without using sharp objects that could tear the silicone; once fitted, screw in the base to make the cup leakproof again. The pack contains two O-rings.
Replacement O-rings: key features
Made for the matte lid
These spare seals are designed for the matte lid on a b.box sippy cup.
Fit without sharp tools
Press the O-ring into the rim with a finger to avoid tearing it.
Restore the seal
Fit the ring evenly, then screw in the base to make the cup leakproof.
