O-ring gasket: CO2 cylinder gasket helps you connect other devices and adapters to the soda refill hose, and easily replace soda cans Good sealing performance: O-ring performance reliably solves these problems: air leakage, not closing when pressing the handle, slow leakage when connected Product size: 3cm (outer diameter) x 2cm (inner diameter) x 1cm (height) This CO2 cylinder gasket is designed for pink soda refill bottles, suitable for DUO Terra Art O-ring sealing is made of high-quality materials, stable and reliable performance, no deformation, long service life