... Warranty 4-) CE/ISO Certificated AC,BC F.R.L air treatment units are same style as AIRTAC. It includes 3 ... selected. ORDER EXAMPLE ORDER EXAMPLE: * Small size, F+R+L three units, port size 1/4", manul drain type, ... model no. is AC2000 * Middle size, F+R+L three units, port size 1/4", auto drain type, ... no. is BL4000 AC/BC Series Filter/Regulator&Lubricator/FR.L Combination/Air Source Treatment Unit