All Sievert Pro burners need a necktube to connect the burner to the handle. The length of the necktube is dependant on the heat output of the burner.. The neck tube should be long enough for the engineer to work safely and comfortably. Long necktubes (3506, 3507 and 3510) are recommended for large jobs where greater heat is required using the 2942, 2943 or 2944 burners.
All Sievert necktubes have a standard M20x1 thread to accommodate all the 2900 and 3900 range of burners.
