SKU: 27929156033

Adjustable Billet By-Pass Regulator 3/8 NPT Kit 12-879KIT

Sale price$119.67 Regular price$132.97
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Description

Adjustable Billet By-Pass Regulator 3/8 NPT Kit 12-879KITAdjustable billet by pass return style fuel pressure regulator 3 8 NPT Kit with Fuel Pressure Gauge and Adapter Fittings Boost Reference 1: 1 Holley Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley. They are precision machined from 6061 T6 billet aluminum for strength and durability. These regulators are adjustable from 4 65 psi and will handle both carbureted and EFI applications. A second pressure

Adjustable billet by-pass return style fuel pressure regulator 3/8 NPT Kit with Fuel Pressure Gauge and Adapter Fittings Boost Reference - 1:1

Holley Billet Fuel Pressure Regulators are part of a complete line of fuel system products from Holley. They are precision machined from 6061-T6 billet aluminum for strength and durability. These regulators are adjustable from 4-65 psi and will handle both carbureted and EFI applications. A second pressure spring is included allowing you to increase the fuel pressure range up to 65 psi for EFI systems. They have 3/8 NPT port sizes to adapt to your new or existing fuel lines. So, if you are currently running a carbureted system but plan to upgrade to EFI in the future, these regulators will have you covered either way.

Features:

  • Adjustable from 4-65 psi for precise fuel pressure adjustments
  • Constructed of billet aluminum with a black anodized base and a clear anodized top for good looks
  • Used in systems with a return line back to the tank
  • (1) 3/8" NPT Inlet; (1) 3/8" NPT Outlet; and (1) 3/8" NPT return
  • Includes fitting for manifold reference
  • Includes an 1/8 NPT gauge port
  • Boost Reference - 1:1
  • The 4-15 psi carbureted spring comes installed in the regulator

Specs:

Adjustable Yes
Brand Holley
Color Black
Emission Code 5
Fuel System EFI/Carb
Fuel Type Gasoline
Gauge Included Yes
Gauge Port Included Yes
Grade Type Performance
Inlet Gender Female
Inlet Port Diameter 3/8Inch
Inlet Port Quantity 1
Inlet Size 3/8" NPT
Inlet Type NPT
Material Aluminum
Maximum Pressure 65Pounds per Square Inch
Minimum Pressure 4Pounds per Square Inch
Mounting Bracket Included Yes
Mounting Type Inline
Outlet Gender Female
Outlet Port Diameter 3/8Inch
Outlet Port Quantity 2
Outlet Size 3/8" NPT
Outlet Type NPT
Port Quantity 2
Product Type Fuel Pressure Regulator
Rebuildable Yes
Return Size 3/8 inch NPT
Style Bypass
Vacuum Port Quantity 1
Warning California Proposition 65
Warranty Limited 90 Day
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 27929156033

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GARY
Belleville, US
★★★★★ 5
PERFECT
Color: Black
Watch is light weight. Has a good feel on the wrist and easy to read during the day and easy to read with the indigo back light at night. I have large wrists and this size is good. For smaller people it might be to large. The functions work well and its water tight. Its durable and keeps on ticking.
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Reviewed in the United States on September 4, 2024
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Jeff
Grantham, US
★★★★★ 5
Solid watch!!
Color: Black/Digital/Black/Green
Great digital watch. Has many features. Built tough and looks great.
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Reviewed in the United States on April 12, 2026
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Jason
Natrona Heights, US
★★★★★ 5
Classic simple digital watch
Color: Black/Digital/Black/Yellow
A classic watch with the clean classic look. A every day wear for the gym, while of course smart watches do it all, this keeps it simple with the basics. No distractions, just a watch that gets the job done. Clear screen and and the classic day glow work perfect. Simple black and yellow color combo is rad, and their come in a varitso you can find one that works for you.
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Reviewed in the United States on December 26, 2025
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William Buxton
Cuba, US
★★★★★ 5
Full Function Economic watch
Color: Gray/Digital/Gray
Best Watch Ever. I have had one for over 20 years. Waterproof. 3 Time Zones if you travel, Stop Watch....timers Alarms.... SIMPLE AND KEEPS GREAT TIME.
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Reviewed in the United States on February 21, 2026
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Jennifer
Natrona Heights, US
★★★★★ 4
Great watch
Color: Gray/Digital/Gray
Great everyday watch—lightweight, easy to read, and does everything I need without being complicated.
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Reviewed in the United States on April 7, 2026

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