... operation in steady pressure, decrease damage of valve and cylinder.Filters remove moisture from compressed air, ensure it is clean and dry ... /2", 3/4", 1"2. QAC- F.R.L (Three Combination) (1) All Models: AC2000-01, AC2000-02, AC3000-02, AC3000 ... Size, Port Size 1/8", Auto Drain Type AC2000-02 Air source treatment Unit (F.R.L Combination)