THESE ARE NEW AND NEVER USED. THEY ARE FOR NATURAL GAS IN AN KOIKE (R) TORCHES. FOR LPG GAS For Hand and Machine Cutting TorchesFits KOIKE® Silver Cut 250 Hand TorchFits KOIKE® Hand Torch, MK-36, MK-48, MK-150, MK-250, MK-300Fits KOIKE® Machine Torch 300L and 500LFits CONCOA® /AIRCO® Hand Cutting Torch Series: 3000, 7000, 9000, 9500, 9700