Years ago, Radial Appliance units were made without the knowledge of long term consequences, which caused several major problems involving their use and handling. These design failures cause the Radial Appliances to break their seals, separate, crack, leak, absorb moisture, rust, and no longer operate. The problem started when these old style design units were made without knowledge of long term consequences. These “Radial” units are defective with long term use. The Baar Radiac corrected these appliances' design flaws.