... +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, model no. is BC2000D * Small size, F.R.+ ... L two units, port size 1/4", auto drain type, model no. is AFC2000D * Middle size, Filter+regulator, ... port size 3/8", manul drain type, model no. is BFR3000 * Middle size, Lubricator, port ...