Special Applications: Clean Series, Body Size: 20, Reverse Flow: No, Thread: NPT, Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: 1+N+Z

Special Applications: Clean Series, Body Size: 20, Reverse Flow: No, Thread: NPT, Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: Y+Z

Special Applications: Clean Series, Body Size: 20, Reverse Flow: No, Thread: NPT, Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: R+Z

Special Applications: 10-AR (Clean Series), Body Size: 20, Reverse Flow: No, Thread: N (NPT), Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: 1NZ (1+N+Z)

Special Applications: 10-AR (Clean Series), Body Size: 20, Reverse Flow: No, Thread: N (NPT), Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: YZ (Y+Z)

Special Applications: 10-AR (Clean Series), Body Size: 20, Reverse Flow: No, Thread: N (NPT), Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: RZ (R+Z)

Note) The set nuts of the AR-A series and those of the AR-B/AR-D series differ in size as well as part number.
The AR-A series catalog can be found here.
The AR-B series catalog can be found here.

SMC Regulator (With Backflow Function) AR20(K)-B To AR60(K)-B Series.Features· Specifications with a backflow function feature an inbuilt mechanism for quickly exhausting the air-pressure at the outlet side.

When assembling high-pressure special order products, AF20 to 60-*-A-X425 and AR20 to 60-*-B-X425, prepare a nipple for installation.

Body Size: 20, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 1/4, Options: Round Type Pressure Gauge, w/Limit Indicator, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Downward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: 0.4 MPa Setting

Body Size: 20, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: G (Round Type Pressure Gauge, w/Limit Indicator), Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Downward, Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale), Made to Order: X406 (0.4 MPa Setting)

This is a legacy product, and replaced byAC25-N02G-3NZ-A, F/R/L COMBO MODULAR, AIRLINE EQUIPMENT, AC MASS PRO, DC, AC MASS PRO 1/4 MODULAR (NPT), 2.64554 lb

Size: 1/8, Reverse Flow: Regulator, Standard, Thread: NPT, Port Size: 1/4, Accessory: Round Pressure Gauge, Option 1: None, Option 2: Name Plate & Pressure Gauge in Imperial Units, PSI, °F

Special Applications: Clean Series, Body Size: 20, Reverse Flow: No, Thread: NPT, Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: N+Z

Special Applications: Clean Series, Body Size: 20, Reverse Flow: No, Thread: NPT, Port Size: 02 [1/4 (Size 20, 25, 30, 40)], Accessory, Not Attached: G [Round Pressure Gauge w/o Limit Indicator (Size 20 to 60)], Option: 1+Z

Body Size: 20, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: G (Round Type Pressure Gauge, w/Limit Indicator), Set Pressure: 1 (0.02 to 0.2 MPa Setting), Exhaust Mechanism: Relieving Type, Flow Direction: R (Right to Left), Knob: Y (Upward), Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale)

Body Size: 20, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: G (Round Type Pressure Gauge, w/Limit Indicator), Set Pressure: 1 (0.02 to 0.2 MPa Setting), Exhaust Mechanism: Relieving Type, Flow Direction: R (Right to Left), Knob: Downward, Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale)

Regulator, Pressure Boosting Valve: Regulator, Regulator Type: Standard, Shape: Standard, Operating Environment: Standard, Compatible Fluid: Air, Exhaust Mechanism (Air Bleed): [Included] Relief, Reverse Flow Function (Relief): No, Supply Side Connection Type: [NPT] NPT, Supply Side, Connection Diameter: 1/4, Flow Direction: [Left] From Right to Left, Control Side Connection Type: [NPT] NPT

Body Size: 20, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 1/4, Options: Round Type Pressure Gauge, w/Limit Indicator, Set Pressure: 0.02 to 0.2 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Right to Left, Knob: Downward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: -

Body Size: 20, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 1/4, Options: Round Type Pressure Gauge, w/Limit Indicator, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Right to Left, Knob: Upward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: -