All Sievert Pro burners, except the soft flame burners, need a necktube to connect the burner to the handle. Shorter necktubes like 3509 and 3511 are recommended for smaller heating applications like gold and silver work. Longer necktubes like 3506, 3507 and 3510 are recommended for larger jobs like roofing and road works.
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Sievert 3507 Bent 500mm Gas Blow Torch Neck Tube Reviews
