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Solve your water woes with Bladder and Diaphragm Expansion TanksHow do bladder pressure tanks work? When the water pressure changes, the volume of air in a bladder pressure tank contracts and expands. Time to time the amount of air in the tank should be measured and the tank recharged if the air is too low. Bladder pressure tanks do not provide any useful water storage capacity. Bell & Gossett Precharged Expansion Tanks come either with a bladder or a diaphragm to separate th …