The efficacy of ethylene oxide gas sterilization is well documented. However, the inherent problems of time and expense, the addition of heat and/or pressure have proved to be deterrents in universal adoption of the method. A simplified procedure using 84 per cent ethylene oxide without heat or pressure is presented. Appropriate culture controls were maintained. Once the proper technique was developed, all routine weekly cultures have been negative since November 1966. Since this system requires no maintenance, power source or installation, it is adaptable to almost any environs including catastrophic conditions.