The Salter Labs Percent-O₂-Lock Venturi System utilizes a transparent, air-entrainment, elongated mask with a soft, anatomical under-the-chin shape, A rotating sleeve air entrainment valve allows users to dial in seven different oxygen concentrations: 24, 26, 28, 31, 35, 40 or 50 percent. 

• Aluminum nose clip aids in a positive fit for appropriate oxygen percentage delivery
• Over-the-ear or elastic head strap styles
• Three-channel, crush-resistant safety tubing comes standard
• A high humidity adapter permits use of a nebulizer
• Unique spring-loaded mechanism locks prescribed concentration in place to ensure safety and correct oxygen concentration
• Durable plastic humidity cap allows utilization of a humidifier or nebulizer with mask when prescribed
• Latex free