The unique, patented design of the E - Z deflator allows for removal of the valve core for rapid tire deflation, while also providing accurate pressure reading via the simple movement of a sliding valve. Corrosion Resistant BrassStainless Deflator Tool. Quality Bronze Bourdon Tube Gauge Design Ensures Accuracy is Not Affected by Changes in Temperature, Humidity or Altitude. Fully Geared, Solid Brass Precision Movement. Protective Rubber Gauge Guard. Easy to Read Dial with One PSI Increments. Thoroughly Designed and Tested to Ensure Accuracy. Includes Protective Canvas Pouch and Instruction Sheet.