The SMC series AW- B combination filter or 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. Modular type filter regulator Transparent bowl guard Available with built-in backflow mechanism Rc, G(PF) or NPT threads