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Teardown and reassembly of SP-35A pump used in Chauvet Hurricane fogger. The pump seems to be the a common point of failure, especially for foggers that are used infrequently and then stored for a long time. My best guess is that the pot metal base corrodes after the liquid sits in it for some time and maybe partially evaporates allowing air to get in. Then the corrosion products get stuck in the other moving metal parts and cause the pump to seize or not seal properly.