The Nalgene Replacement Loop-Top Cap is a tough and convenient replacement for your misplaced or broken cap. Simply secure the loop under the lip of the water bottle and screw the cap on. Replacement cap for Nalgene 500ml Small Wide Mouth bottles
Cap measures 53 mm or about 2.25 inches
Note: This cap will only fit Nalgene 500ml Small Wide Mouth bottles; will not fit 1000ml Wide Mouth bottles.