This is one of those parts that makes installs and future maintenance a lot easier. This 2 1/2 slip-on flange is 304 Stainless Steel with a raised face face in 150#. ItÕs commonly selected for general service applications and everyday plant use. Slip-on flanges slide over the pipe, which can make alignment easier during fabrication and installation. Raised face is the most common sealing face youÕll see for many standard industrial flange connections. The job of this slip-on flange is straightforward: it gives you a standard bolt-up point so your line can connect to other flanged components.