This product is being discontinued and will be replaced by AW-D series.This combination Filter/ Regulator minimizes space and  piping by integrating the 2 units into one. Standard  features include a relieving regulator, which can be quickly  locked by pushing down on the adjustment knob. There are  many options, which include gauges, auto-drain, metal bowl  and covers, different set pressures, etc.   The AW-B is part  of the family of modular air preparation units and can be  combined with other similar sized products. This series is  available in 3 body sizes with piping from 1/8 to 3/4 in  Rc, NPT or G thread types. Integrated filter and regulator units save space and require less piping. With the backflow function it incorporates a mechanism to exhaust the air pressure in the outlet side reliably and quickly.