SMC Corporation of America
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SMC 21-ARP20-N02BG-1YZ precision regulator, REGULATOR, PRECISION
The ARP20/30/40 series is available with a back flow function that exhausts the air pressure in the outlet side reliably and quickly. 
https://www.smcpneumatics.com/21-ARP20-N02BG-1YZ.html
ARP20/30/40, Direct Operated Precision Regulator, Special Applications

The ARP is a modular style, direct operated precision regulator.  A locking adjustment knob allows the pressure to be set, and then locked to prevent accidental setting changes. The ARP20/30/40 series is available with a backflow function that exhausts the air pressure in the outlet side reliably and quickly

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PDF Icon How To Order: Series ARP20 to ARP40 10- 10- 21- 21- Direct฀Operated฀Precision฀Regulator Series ARP20K to ARP40K 10- 10- Direct฀Operated฀Precision 21- 21- Regulator฀with฀Backflow฀Function

https://partbuilder.smcpneumatics.com/hto_pdf/10_ARP.pdf
PDF Icon Catalog: Direct Operated Precision Regulator/Modular Style ARP20 to ARP40 Direct Operated Precision Regulator with Backflow Function/Modular Style ARP20K to ARP40K Regulator JIS symbol Regulator with backflow function

https://www.smcpneumatics.com/pdfs/ARP_3018A.pdf
ARP20/30/40, Direct Operated Precision Regulator, Special Applications

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ARP20-N02BG-1YZ

Size: 20, Backflow Function: None, Thread: N (NPT), Port Size: 02 (1/4), Accessory: BG (B+G), Specifications: 1Y (1 + Y), Pressure Unit: Z (Name plate & Pressure Gauge in Imperial Units: psi)

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ARP20-N02BG-1YZ

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

https://www.smcpneumatics.com/Part-Builder-Links_ep_2458-1.html?https://inventory.partbuilder.smcpneumatics.com/vona2/detail/221006473195/?HissuCode=ARP20-N02BG-1YZ