All Sievert Pro burners, except the soft flame burners, 2960 need a necktube to connect the burner to the handle. The Sievert 3501 Lightline neck tube is only suitable for use with burners 8842, 8719, 8720, 8723 and 8725.
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Sievert 3501 78mm Lightline Gas Blow Torch Neck Tube Reviews