For use with the cough machine. Superior ergonomic cushion design provides an optimal seal with minimum pressure. Ultra-thin wall air-filled cushion is soft and comfortable. Provides superior seating and sealing characteristics. Inflation valve adjusts cuff pressure for optimal use. Clear body permits easy patient observation. Connector port is centered and positioned for secure gripping. Easy connect/disconnect surface. Flexible body allows gentle deep seating of cushion to face. Hook ring is removable. Adapter (sold separately) is required to attach this mask to your tubing.