Working Pressure Of Product Design 0.03 Bar.3. Adults Should Slowly Inflate Each Chamber In Numbered Order (If Marked) With A Foot Or Hand Operated Air Pump. Make Sure The Device Feels Firm But Not Hard. Caution: To Avoid Bursting, Do Not Inflate Too Much Or Use A High Pressure Air Compressor Or Exceed The Recommended Design Working Pressure. Fill With Cold Air Only