• Replacement rubber stopper for hot water bottle. • Plastic cap with leak-proof closure. • Material: rubber, anti-aging, and odorless. • Dimensions: 3.50 x 2.50 x 2.50 cm. • Easy to use, no complicated processes required. • High density, does not break easily. • Threaded pattern design for good sealing. • Includes 2 stoppers for hot water bottle. • The cap is flexible and does not damage the mouth of the bag. • Good heat preservation.