All Klean Kanteen caps and lids are interchangeable with all sizes of Klean Kanteen water bottles and only use non-leaching, toxin-free, polypropylene (pp#5) or stainless steel in their caps and lids.
Although Klean Kanteens are dishwasher safe, washing Stainless Steel caps in the dishwasher is not recommended because H2O can squeeze itself in between the Stainless Steel and the Polypropylene pieces.