MSA 464046 Comfo Respirator Cartridge Gas Respirator Cartridge. LOW COST OF OWNERSHIP: Mask reusability eliminates the costs of replacement, all respirator components can be handled without special tools for quick maintenance and minimal downtime. Any product you return must be in the same condition you received it and in the original packaging. Please keep the receipt. We usually respond within 24 hours on weekdays. Thank you for shopping at our store.