The BP-6 Series was originally designed as a back pressure regulator for reverse osmosis water purifi cation systems. It may also be easily used in pilot facilities and large instrumentation systems. The standard 316 stainless seat assembly, which was intended for long term usage in sea water, can also be useful in various chemical environments. While the stainless seat assembly does not off er tight shutoff, it is not normally required in high fl ow systems. If a more positive shutoff is required a PTFE/stainless seat assembly is available. The BP-6 Series is normally provided in 316 stainless construction but other materials are available.