... units are same style as AIRTAC. It includes 3 parts: filter, regulator and lubricator. With port size from 1/8"~1/2 ... /4", auto drain type, model no. is AFC2000D * Middle size, Filter+regulator, port size 3/8", manul drain type, model no. is ... , port size 1/2", model no. is BL4000 AC/BC Series Filter/Regulator&Lubricator/FR.L Combination/Air Source Treatment Unit