DIRECT FROM MANUFACTURER AND MADE IN THE USA Hard foot pedal, built for heavy duty applications, has a soft internal foot bellow that sends a pulse of air to the air switch turning equipment on/off, creating a hands free operation. Rectangular Shape 1/4″ O.D., 1/8″ I.D. Air Tubing Black Waterproof, Explosion Proof, and Shockproof foot pedal at the point of actuation for hazardous environments.