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Hi everyone, I have a question posed by one of my customers. His 1" spirovent has failed and we are trying to determine if they are serviceable. Close examination shows no indication of being able to disassemble the unit. Thinking mineral buildup is blocking the air vent or interfering with the spring action. Not original owner and has no paperwork to take advantage of the warrenty. Can the unit be disassembled or cleaned internally with fluids? Thanks in advance for any help on this matter. - Mr Ed