... standard dimensions and steady performance.It is same style as SMC.Regulators insure operation in steady pressure, decrease damage of valve ... "2. QAC- FR.L (Two Combination) (1) All Models: QAC2010-01, QAC2010-02, QAC3010-02, QAC3010-02, QAC4010-04, QAC4010-06 ... , QAC5010-06, QAC5010-10(2) Metal Protective Hood: QAC2010-01, QAC2010-02 are not available. Others have metal hood.Selection ...