6 PCS O Ring for Hydroflask Wide Mouth Lid, 2'' to 2.3'' Rubber Seal for Hydro F
Perfect fit : Only fit hydro flask wide mouth flex cap 20 oz, 32 oz, 40 oz and 64 oz. Fit Hydro Flask Wide Flex Straw Cap 16oz, 24oz, 32oz, 40oz and 64oz. Not fit hydroflask tumbler, not fit narrow standard mouth lid or coffee lid.