You're getting a 1 1/2 slip-on flange in 316 Stainless Steel built around a raised face sealing surface and 150# pattern. They're widely used because they simplify fit-up before weldingÑhelpful when you're working on a tight schedule. Use this slip-on flange when you want a familiar, bolt-together connection you can service later without drama. The raised-face sealing surface is designed to mate well with common gasket styles used on stainless systems. 316 provides extra protection compared to 304 in many real-world conditions. Order it when you're ready, and if you want a second set of eyes on fitment, just reach out to our team.