3M™ DIN Thread Gas & Vapour Filters have a DIN threaded connection that fits certain half or full facepiece 3M™ DIN Threaded Reusable Respirators. Compatibility and approvals between filters and facepiece depends on regulations. Please refer to the Technical Datasheet to ensure filter and facepiece are approved. These cartridges offer heavy duty breathing protection for a wide range of hazardous environments.