TSO3 Inc. announced that it has received 510(k) clearance from US regulators for a significant improvement to its STERIZONE VP4 Sterilizer. The cleared change can improve the customer installation process and reduce start-up costs by significantly reducing the oxygen supply requirements for the system. All of the Company's new STERIZONE VP4 Sterilizers, along with any upgraded units in existing inventories, can now incorporate this new feature and several other additional customer improvements intended to improve the user experience.