Fits: MSA Millenium Gas Mask.
Available in single canisters or in a box of 6.
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Unfortunately, there is no straight answer because there are too many variables. The life span of any cartridge depends on the type of gas, the age of the cartridge, the temperature, how heavily you're breathing, and a bunch of other factors. You'll know when the cartridge is nearing the end of its life when it gets harder to breath through it or you can begin to taste and smell through the cartridge. Some canisters and cartridges, typically ones designed for working with really dangerous chemicals, change colors as they're used up, but these are not unfortunately.
Not 100% sure but I think they are universal fit they should have a 40mm thread.
They have a 4 year shelf life, UNOPENED, there is an expiration date on the foil package.
How long this will last will be different for you than it would be for me, it's just like wearing a SCBA with a 30 minute bottle, you might be able to last for 25 minutes before you will have to exit the area, I might only be able to stay there for 15 minutes before I need to exit.
As far as reusing the canisters we don't recommend you do this, it's already been partial used, and it might have been used for 1 type of hazmat and now your going into a different hazmat area. we would say a big DO NOT do this