Porter’s unique double mask has proven time and again to be the most efficient system for scavenging of waste nitrous oxide. The soft and pliable inner liner creates a tight, yet comfortable seal around the patient’s nose – thus assuring the Porter mask’s superior scavenging efficiency. Adult and pediatric sizes are available. Hood kits include one outer hood and three inner liners. Additional inner liners can be purchased separately. Retro fit kits are available for most modern nitrous oxide flowmeters. Outer hood and inner liners are easily cleaned with soap and water, and steam sterilization – saving you both time and money.