106 / 206-PR-SM is a pressure reducing control valve with an integral back-up which is the 81-RP pilot wherein it protects the device against diaphragm or pilot failure and reduces unnecessary maintenance. This product is made of ASTM B-62 bronze or ASTM B-16 brass and AISI 303 / 316 stainless steel trim. There is a main valve which has 106-PGM or 206-PGM, a strainer with a 40 mesh stainless steel screen and 26 flow stabilizer which has several sizes such as 8 in / 200 mm 106, 10 in / 250 mm 206 and smaller is included. You can also assemble the limit switch on the device but it is not required and is optional. This device provides downstream surge protection.