This particular fitting is a gasket for 1.5 inch-sized tri-clamp fittings. A gasket is needed between two tri-clamp fittings when joining them together. This gasket is made of silicone which makes it perfect for both cold and hot side brewing applications as they can withstand temperatures of up to 450F. Tri-clamp fittings make it easy to quickly break down your brewing setup for cleaning and sanitation. Tri-clamp fittings, also known as tri-clover fittings, are commonly used in professional brewery settings due to the sanitary connection made by using a gasket and clamp to connect two fittings together. These fittings can easily be broken down for cleaning and sanitizing, and do not contain any tricky threads where dirt and bacteria can hide. Get on board with tri-clamp fittings today!