Dialing in a stainless line and want hardware you can trust from day one? This 3 slip-on flange is 304 Stainless Steel with a raised face face in 150#. 304 stainless is a reliable all-around choice for many industrial environments where corrosion resistance matters. They're widely used because they simplify fit-up before weldingÑhelpful when you're working on a tight schedule. If you've ever needed to bolt pipe to a valve or piece of machinery, this slip-on flange is the part that makes that connection possible. It's built with a raised-face surface to help create a confident seal when paired with the right gasket.