You may not need this refill water cartridge often, but at some point in your cigar-smoking career, the audible and visible alert of your Hydra will go off, telling you it needs more 'juice.' That's where this handy refill comes into play. Just switch cartridges and you're good to go for a long period of time, enjoying zero-maintenance cigar storage.
Cartridge ships empty. Always use distilled water, only.
Depending on your unit, choose either 'SM' or 'LG' cartridge. 'SM' Refill measures - 6"L x 2"W 'LG' Refill measures - 11"L x 4 1/4"W