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Aro-Flo Series Air Line Regulator, 3/8 NPT Ports, 0-140 PSI PSI Spring Range, 179 SCFM Flow Rating

Description & Features

Designed for consistent downstream pressure control in compressed air systems, the Aro-Flo Series Air Line Regulator, 3/8 NPT Ports, 0-140 PSI Spring Range, 179 SCFM Flow Rating is a relieving-type regulator suited for general industrial pneumatic applications. The 3/8 NPT port size and 179 SCFM flow capacity make it appropriate for mid-range pneumatic equipment where stable, regulated pressure is required.

Part of the Ingersoll Rand Aro 2000 Series, this unit features an aluminum body construction with nitrile and nylon diaphragm, nylon and nitrile valve components, steel springs, and nitrile o-rings. Maximum inlet pressure for this series is 250 PSI, with an operating temperature range of 23–140°F. The relieving design allows downstream overpressure to vent, which is standard for most pneumatic circuit configurations.

Compatible with Aro-Flo filters and lubricators, this regulator can be assembled into two- or three-piece FRL combinations using modular spacer kits. No gauge is included with this configuration; a 1/8 NPT gauge port is available on 2000 Series units.

SKU: R37331-100

Supplier Part Number (MPN): R37331-100

Alternate Part Numbers: C1KH45

Specifications

Dimensions 2.78W x 5.47H	Brand Ingersoll-Rand Special Quotes	Brand Ingersoll-Rand	Pack Size 1.00	UOM EA	Flow Rating (SCFM) 179	Gauge No	Port Size 3/8 NPT	Pressure Range (psi) 0-140 PSI	Series 2000	Supplier Part Number R37331-100	Alternate Part Numbers Alternate Part Number C1KH45	Product Weight 1.47 lbs

Similar Products

Model Number	Series	Flow Rating (SCFM)	Type	Pressure Range (psi)	Gauge	Dimensions
R37111-100 Aro-Flo Series Air Regulator	1000	45	Relieving	0-140 PSI	Yes	1.58W x 3.56H
R37121-100 Aro-Flo Series Air Regulator	1000	59	Relieving	0-140 PSI	No	1.58W x 3.56H
R37221-100 Aro-Flo Series Air Regulator	1500	86	Relieving	0-140 PSI	No	2.21W x 4.77H
R37331-600 Aro-Flo Series Air Regulator	2000	179	Relieving	0-140 PSI	Yes	2.78W x 5.47H
R37341-100 Aro-Flo Series Air Regulator	2000	215	Relieving	0-140 PSI	No	2.78W x 5.47H
R37341-600 Aro-Flo Series Air Regulator	2000	215	Relieving	0-140 PSI	Yes	2.78W x 5.47H

Product Questions & Answers (3)

Question by: Rick J on Aug 28, 2025, 7:56 AM

got a 3/8 npt air line, will this regulator screw right in and what kind of pressure range am i looking at

Answer by: Customer Support on Aug 29, 2025, 3:28 PM

For a 3/8 NPT setup, it matches with 3/8 NPT ports. The standard adjustment range on this one is 0 to 140 psig.

Question by: Travis E on Apr 13, 2025, 3:31 PM

What size threads are on this regulator?

Answer by: Customer Support on Apr 14, 2025, 8:54 PM

This regulator has 3/8 NPT ports for connecting to your air lines.

Question by: Ronnie A on Aug 25, 2025, 6:08 AM

We're running 3/8 NPT lines on a mid-size pneumatic setup and need a regulator that'll keep pressure steady through the whole shift. This unit handle that kind of continuous use at the 179 SCFM rating?

Answer by: Customer Support on Aug 26, 2025, 9:39 PM

For mid-range pneumatic equipment on 3/8 NPT lines, the flow capacity and port size on this regulator line up well with that kind of application. The 179 SCFM rating reflects what the unit can move at full capacity, and the relieving design means if downstream pressure creeps up past your set point, it vents automatically rather than letting pressure build unchecked. Inlet pressure can go up to 250 PSI, and the adjustable spring range runs 0 to 140 PSI on the downstream side, so you've got good headroom to dial in whatever your equipment calls for.