Hi Adjust A Roll Stands, Aluminum Wheels, 2000 lb Cap, 1 2 in to 36 in Pipe no checkout Safely and quickly starts and Safely and quickly starts and stops the machine by depressing or releasing foot pedal Durable replacement foot switch assembly Designed for use with Ridgid® Models 300 and 535 Pipe Threading machines and brazing applications Ensures pressure tight connections made in seconds Built in automatic reset check valves prevent reverse flow of gas by cutting off the gas under back pressure Oxygen and fuel gas models are not interchangeable in order to prevent wrong connections Color coded for fast Roller adjustment from either side Fast adjustment for easy pipe positioning Clean and simple design avoids welder interference Wheel tried for true pipe rotation Bronze bearing to eliminate arcing