The Moldex 0073 replacement diaphragms are for use with the 7000 and 9000 series respirators. Only buy the necessary replacement parts and save the cost of replacing the entire unit. Respirators should be inspected regularly for worn parts to maintain safety. Each bag includes 20 inhale and 5 exhale diaphragms. Moldex 7000 or 9000 series respirators are designed for comfort and versatility. They can be used with custom combinations of various filters and gas/vapor cartridges.