3M Face Seals are designed for use with 3M Air Feed welding helmets. This spare part replaces worn, damaged or unhygienic face seals.3M Face Seals are designed for use with 3M Air feed welding helmets. This spare part replaces worn, damaged or unhygienic face seals. Genuine 3M Accessory. For maximum safety and comfort, regularly check your equipment for worn or damaged parts.