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foreign even though the world waterworks air whip pump is robust over time some parts such as the mechanical seal will need to be replaced in order to change out the mechanical seal it is recommended that the air line be disconnected and the suction and discharge piping be disconnected from the pump then flip the pump upright on the motor for easier access to the wet end and seal of the pump first remove the bolts from the casing cover then pull off the cover and remove the o-ring from the seal groove next remove the impeller screw depending on the tightness of the screw the impeller may need to be secured by an insulated tool while you loosen the screw then remove the o-ring and slide off the impeller if the impeller is sticking to the shaft a pry bar can be used to lightly lift it off the shaft once the impeller is removed pull off the cover assembly which holds the stationary portion of the mechanical seal then use an allen wrench to loosen the set screws and lift th