Goss EA-1G Acetylene Regulator with "A" Hose Fitting and "B" Acetylene Tank Connection For use with "B" Acetylene Cylinders (CGA520) Hose Outlet fitting: "A" 3/8-Inch-24-Inch, LH 2-15 PSI pressure range, Single Stage Includes cylinder content gauge with 1/4, 1/2, 3/4 and Full display