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DO NOT attach the heater body sections together on the ground and attempt to hang the entire system at onetime. The weight of the individual heater body sections can cause misalignment and damage to the heater. 3. Join the body sections together and secure with tube couplings as follows: AWARNING: The following coupling tightening instructions must be followed properly to avoid future problems. a. Place the compression coupling over the end of the tube from one body section, with the tighteni