The gas kit without a controller is designed for use with TIG welding equipment. This kit does not have a gas controller, which allows you to simply and effectively connect to the welder without the need for additional gas control. It is compatible with models: PI 350 TIG DC, PI 350 TIG AC/DC, PI 500 TIG DC and PI 500 TIG AC/DC, providing a reliable and efficient supply of welding gas. It is ideal for users looking for simplicity and efficiency in welding, eliminating the need for complicated operation.