This apparatus is amazing. I love these so much! I service them and they are a breeze! Pop off the cap and refill the dry chemical, and replace. Take out the cartridge and replace it with a new one, tamper seal it, clean it, and you're done! Needless to say they are easy to carry and many fire fighters I work with swear by them. Having used one on a fire myself, they are astoundingly effective and fast! A+ for the Ansul/Tyco Company for innovative design.

More can be found at Ansul's website.