Size: 30 (3/8), Port Size: 03 (3/8, Size 30), Accessories: H (Panel Mount Nut), Handle Orientation: Y (Handle Up)

Size: 30 (3/8), Port Size: 03 (3/8, Size 30), Accessories: B (Mounting Bracket), Handle Orientation: Y (Handle Up)

Body Size: 30, Backflow: w/o Backflow Function, Thread: Rc, Port Size: 3/8, Mounting: w/Bracket, Set Pressure: 0.02 to 0.2MPa, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Downward, Pressure Unit: Name Plate and Pressure Gauge in Imperial Units; MPa

Size: 3/8, Port Size: 1/4, Size 20, Accessories: Mounting Bracket, Handle Orientation: Handle Up

Size: 3/8, Port Size: 3/8, Size 30, Accessories: None, Handle Orientation: Handle Up

Size: 3/8, Port Size: 3/8, Size 30, Accessories: Panel Mount Nut, Handle Orientation: Handle Up

Size: 3/8, Port Size: 3/8, Size 30, Accessories: Mounting Bracket, Handle Orientation: Handle Up

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 3/8, Options: w/o Mounting Option, Set Pressure: 0.05 to 0.85 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: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 3/8, Options: w/o Mounting Option, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Non-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: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 3/8, Options: w/Bracket, Set Pressure: 0.05 to 0.85 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: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 1/4, Options: E+H, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Upward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 1/4, Options: Square Embedded 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: Upward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 3/8, Options: Square Embedded 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: Upward, Pressure Units: Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale, Made to Order: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: NPT, Port Size: 3/8, Options: Round Type Pressure Gauge, w/Limit Indicator, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Non-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: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: Rc, Port Size: 3/8, 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: Downward, Pressure Units: Unit on Product Label: MPa, Pressure Gauge in SI Units: MPa, Made to Order: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: Rc, Port Size: 3/8, Options: w/o Mounting Option, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Right to Left, Knob: Downward, Pressure Units: Unit on Product Label: MPa, Pressure Gauge in SI Units: MPa, Made to Order: 0.4 MPa Setting

Body Size: 30, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: B (w/Bracket), Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Y (Upward), Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale), Made to Order: X406 (0.4 MPa Setting)

Body Size: 30, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: w/o Mounting Option, Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Y (Upward), Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale), Made to Order: X406 (0.4 MPa Setting)

Body Size: 30, Backflow: w/o Backflow Function, Thread: N (NPT), Port Size: 02 (1/4), Options: BE (B+E), Set Pressure: 0.05 to 0.85 MPa Setting, Exhaust Mechanism: Relieving Type, Flow Direction: Left to Right, Knob: Y (Upward), Pressure Units: Z (Unit on Product Label: psi, Pressure Gauge: MPa/psi Dual Scale), Made to Order: X406 (0.4 MPa Setting)

Refer to the AR-A/AR-B/AR-D series catalog excerpt, which has been reproduced below.
The part numbers of standard AR20 to AR60 round type pressure gauges are “G36-10-01” and “G46-10-01”(for the R thread type).
For example, the part number of the AR30-03BG-A pressure gauge is “G36-10-01.”