Skip to main content
PetLawn & GardenTruck & AutomotiveClothingPoultryHeating & CoolingHorseSporting GoodsOutdoor Power EquipmentFencing & GatesLivestockOutdoor LivingPet & Animal PharmacyToolsHome ImprovementFarm & RanchBoots & ShoesTrailers & TowingHome Decor & FurnitureWild Birds & WildlifeToysGift CardsServices Propane RefillTrailer RentalGarden CenterFeed CenterSame Day DeliveryPetVet ClinicPet WashGrooming at PetsenseDog Training at PetsenseTractor Supply RxPet InsuranceWag!Savings and OffersWeekly AdSaleClearanceMore OptionsWeekly AdWhat's NewTractor Supply AppEarn Rewards with Neighbor's ClubHometown HeroesLife Out Here BlogTSC Exclusive BrandsTop BrandsClearance ItemsBattery FinderOutdoor Power Equipment Parts FinderHitch Finder

Presidents Day Sale Through Sunday

|
Shop Now
Order statusTSC Credit CardsWhat’s newPetsenseWeekly Ad
​

Sign In / Enroll

Get rewarded!


0.0
(0)
0.0 out of 5 stars.
A woman outside with a dog
A woman outside with a dog
  1. Home
  2. /
  3. Tools
  4. /
  5. Air Compressors & Air Tools
  6. /
  7. Air Compressor Accessories & Parts
  8. /
  9. Filters, Regulators & Lubricators
  10. /
  11. ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300

  1. Home
  2. /
  3. /
  4. Filters, Regulators & Lubricators
Shop all ARO

ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300

Item # 191483199

Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
$71.99

Sale

Was$79.99

Save $8.00

financeCard Logo
New Cardmembers earn a $50 Reward‡ with qualifying purchase of $50 or more plus earn 5% in Rewards+ on this purchase. Valid through 3/22/26.Apply now
Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Shop all ARO

ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300

Item # 191483199

Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
Image showing  2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-300
$71.99

Sale

Was$79.99

Save $8.00

financeCard Logo
New Cardmembers earn a $50 Reward‡ with qualifying purchase of $50 or more plus earn 5% in Rewards+ on this purchase. Valid through 3/22/26.Apply now
​

Neighbor's Club logo
Neighbor’s Club Members earn points with purchases.

Sign in or Join Now

Use the ARO 2000 Series Air Line Compressor Regulator to deliver controlled, consistent air pressure as required. Ideal for specific pneumatic equipment connected to the air system, this air line compressor regulator has the power to complete a variety of repair projects efficiently and conveniently. The air line regulator is offered with a standard adjustment range of 0-140 PSIG (0-9.6 BarG).

For additional information on this product, please see the Product Documents section for all downloadable user manuals, installation guides, brochures and warranty statements.

  • Offered with a standard air line regulator adjustment range of 0-140 PSIG (0-9.6 BarG)
  • Delivers controlled, consistent air pressure as required
  • Ideal for specific pneumatic equipment connected to the air system
  • Air line compressor regulator is equipped with a 3/8 in. NPT port
  • Relieving design
  • Standard knob control

Similar Items

  1. ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-400

    $71.99
    Was $79.99Save $8.00
  2. ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-400

    $76.49
    Was $84.99Save $8.50
  3. ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-200
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-200

    $71.99
    Was $79.99Save $8.00
  4. ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Relieving
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Relieving

    $31.49
    Was $34.99Save $3.50
  5. ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, Knob

    $152.99
    Was $169.99Save $17.00
  6. Top Rated
    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-300
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-300

    $71.99
    Was $79.99Save $8.00
  7. ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-400

    $26.99
    Was $29.99Save $3.00
  8. ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-200
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-200

    $26.99
    Was $29.99Save $3.00
  9. ARO 1500 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1500 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob

    $62.99
    Was $69.99Save $7.00
  10. ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, Knob

    $161.99
    Was $179.99Save $18.00
  11. ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, 0-140 PSIG, Knob, Non-Relieving
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, 0-140 PSIG, Knob, Non-Relieving

    $119.99
  12. ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Non-Relieving
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Non-Relieving

    $35.99
    Was $39.99Save $4.00

Top Presidents Day Deals

  1. Ingersoll Rand 5 HP 80 gal. 2-Stage Reciprocating Air Compressor, 175 PSI
    4.5 out of 5 stars with 1730 reviews
    4.5 (1730)

    Ingersoll Rand 5 HP 80 gal. 2-Stage Reciprocating Air Compressor, 175 PSI

    $0.00
  2. Flexzilla 1/2 in. x 50 ft. PVC/Rubber Air Hose with 3/8 in. MNPT Fittings, 300 PSI
    4.7 out of 5 stars with 9 reviews
    4.7 (9)

    Flexzilla 1/2 in. x 50 ft. PVC/Rubber Air Hose with 3/8 in. MNPT Fittings, 300 PSI

    $0.00
  3. Top Rated
    Flexzilla 3/8 in. x 50 ft. Open Face Retractable Air Hose Reel
    4.8 out of 5 stars with 130 reviews
    4.8 (130)

    Flexzilla 3/8 in. x 50 ft. Open Face Retractable Air Hose Reel

    $0.00
  4. SmartFlex 3/8 in. x 50 ft. Air Hose with 1/4 in. MNPT Fittings, 300 PSI
    4.6 out of 5 stars with 25 reviews
    4.6 (25)

    SmartFlex 3/8 in. x 50 ft. Air Hose with 1/4 in. MNPT Fittings, 300 PSI

    $0.00

Customers Also Bought

  1. ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 3/8 in. NPT, Knob, Relieving, R37331-400

    $76.49
    Was $84.99Save $8.50
  2. ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-400

    $71.99
    Was $79.99Save $8.00
  3. ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-200
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-200

    $71.99
    Was $79.99Save $8.00
  4. Top Rated
    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-300
    5.0 out of 5 stars with 1 reviews
    5.0 (1)

    ARO 2000 Series Air Line Compressor Regulator, 1/2 in. NPT, Knob, Relieving, R37341-300

    $71.99
    Was $79.99Save $8.00
  5. ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-400
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-400

    $26.99
    Was $29.99Save $3.00
  6. ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-200
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Relieving, R37111-200

    $26.99
    Was $29.99Save $3.00
  7. ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, Knob

    $152.99
    Was $169.99Save $17.00
  8. ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Relieving
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/4 in. NPT, Knob, Relieving

    $31.49
    Was $34.99Save $3.50
  9. ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, 0-140 PSIG, Knob, Relieving, R37461-100
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, 0-140 PSIG, Knob, Relieving, R37461-100

    $152.99
    Was $169.99Save $17.00
  10. ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 1 in. NPT, Knob

    $161.99
    Was $179.99Save $18.00
  11. ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Non-Relieving
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 1000 Series Air Line Compressor Regulator, 1/8 in. NPT, Knob, Non-Relieving

    $35.99
    Was $39.99Save $4.00
  12. ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, 0-140 PSIG, Knob
    0.0 out of 5 stars with 0 reviews
    0.0 (0)

    ARO 3000 Series Air Line Compressor Regulator, 3/4 in. NPT, 0-140 PSIG, Knob

    $152.99
    Was $169.99Save $17.00

Reviews

Review this Product

Select to rate the item with 1 star. This action will open submission form.
Select to rate the item with 2 stars. This action will open submission form.
Select to rate the item with 3 stars. This action will open submission form.
Select to rate the item with 4 stars. This action will open submission form.
Select to rate the item with 5 stars. This action will open submission form.
Be the first to review this product
Get the top deals, latest trends and more
Sign up for emails from Tractor Supply today.
First Name*
Last Name*
Email*

Customer Support

  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  

    (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

About Us

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

Work With Us

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

Neighbor's Club

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

Credit Center

  • TSC Credit Card

  • Klarna

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More

Stay Connected

Connect & Share with the Tractor Supply Community.

Tractor Supply App

Shop on the go with the Tractor Supply App

Learn More
  • Order Status

  • Return Policy

  • Delivery Options

  • Tax Exemptions

  • Frequently Asked Questions

  • Contact Us

  • Recall Notices

  • Call:  (877) 718-6750

  • Mon - Sat: 7am - 9pm CT

  • Sun: 8am - 7pm CT

  • Closed Christmas Day

  • Who We Are

  • Investor Relations

  • Stewardship

  • Community

  • Military Support

  • Product Catalog

  • Tractor Supply Stores

  • .Pharmacy Verified Website

  • Careers

  • Sponsorship

  • Affiliate Program

  • Potential Vendor Partners

  • Vendor Information

  • Tractor Supply Media Network

  • About

  • Rewards

  • Hometown Heroes

  • Frequently Asked Questions

  • Terms & Conditions

  • TSC Credit Card

  • Klarna

Connect & Share with the Tractor Supply Community.

Shop on the go with the Tractor Supply App

Learn More
  • Privacy policy
  • Your Privacy Choices
  • Terms and Conditions
  • California Transparency Act
  • Legal Notices
  • Accessibility
  • Responsible Disclosure Statement
  • Surprise (Balance) Medical Billing Disclosure
  • Transparency in Coverage
  • Human Rights Policy
  • Vendor Code of Conduct
  • California Notice of Collection
  • Privacy Requests

© 2026, Tractor Supply Co. All Rights Reserved.

Select a store
​
Error:
{' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '} {' '}
Something went wrong on our end! Please select your closest store to continue shopping.