54 AW AL AR AFM / AFD AF Attachment AW+AFM AF+AFM+AR AF+AR AW+AL AF+AR+AL AC Regulator Series AR P.55 to 62 Model Port size Options AR10-A M5 x 0.8 Bracket Round type pressure gauge Set nut (for panel mount)* AR20-A 1/8, 1/4 AR25-A 1/4, 3/8 AR30-A AR40-A 1/4, 3/8, 1/2 AR40-06-A 3/4 * The AR20-A to AR40-06-A are not compatible with existing AR series. Series AR Modular Type Regulator