This swan neck includes the gas diffuser and spring and fits the following models: 850, 852, 494, 492, 834, 840, 521, NAPA models 83-320, 83-327, 83-364, 83-369, 83-390 Marquette M12190, M12209, M12208, M12205, 12204, and Snap-On MIG115 Availability: Contact us for availability. Swan Neck for 220V models 1469$16.00