This tri-clamp is made of 304 Stainless Steel ( Single Pin Clamp with 1.5 inch) for resistance to corrosion and high temperatures. 1/2" diameter disc on two fittings are clamped together with a high temp FKM gasket in between, providing a clean efficient connection for valves, hoses, etc. NOTE: Pipe and tube fittings are components used for connecting, terminating, controlling flow, and changing the direction of piping in many different industries. Sanitary fittings are used in the food, beverage, biotech, pharmaceutical, and other sanitary process industries to transport fluids through pipe lines and are available in a range of materials, finishes, and shapes. When purchasing fittings, consider the application, as this will affect material type, shape, size, and required durability. Fittings are available threaded or unthreaded, in many shapes, styles, sizes, and schedules (pipe wall thickness).