SKU: 43769262318

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

Sale price$93.57 Regular price$103.97
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Ships within 48 hours · Estimated delivery Jul 20 - Jul 25

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Description

Adjustable Billet By-Pass Regulator-3/8 NPT - 12-879Overview: 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 are offered with two port sizes, 3

Overview:

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 are offered with two port sizes, 3/8" NPT or 6AN 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 Port
  • 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
  • Compatible with diesel fuel and E85

Application:

Year Make Model Submodel Engine Size
Universal

Specs:

Brand Holley
Color Black
Emission Code 5
Fuel System EFI/Carb
Fuel Type Gasoline
Inlet Size 3/8 inch NPT
Material Aluminum
Outlet Size 3/8 inch NPT
Product Type Fuel Pressure Regulator
Return Size 3/8 inch NPT
Style Bypass
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: 43769262318

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4.4 ★★★★★
Based on 8 reviews
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J
Verified Purchase
JJW
Cuba, US
★★★★★ 3
Mounting system doesn’t align on one of three shelves.
Color: Walnut, Size: 3 Pack
Nice shelves. Install was super easy except on one of the three shelves. The main mounting shelf holes were off so the shelf will not slip onto horizontal mounting poles unless I modify the shelf. So a 20 minute job becomes a two hour job. The mounting system does appear very sturdy just not aligned.
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Reviewed in the United States on January 4, 2026
J
Verified Purchase
Jacob D. Kettle
Whiting, US
★★★★★ 5
Great center piece for my gaming room
Size: 7.9"D x 39.4"W x 34.3"H, Color: White, Size: 7.9"D x 39.4"W x 34.3"H, Color: White
It’s quite large, but you can display a lot of your cool collectibles on it. It arrives in a nicely packaged box with instructions, although I found the instructions to be quite basic. Most people should be able to figure it out. Instead of following the instructions, I recommend forming the honeycomb structure on one side and then attaching it to your wall. Drill holes through the holes in the honeycomb, ensuring everything is level. Once the entire unit is assembled, one person can hang it on the wall. However, I suggest having a building partner. I attempted it alone and was straining my core while reaching on a ladder, which was probably not the wisest idea. The build quality appears to be very good, and I believe it will last for many years. The LED light colors are nice, though not as good as those on a razor, but they’re not bad for a third-party product. There are plenty of screws to install, with a couple of extra. Just for reference my computer screen in the g9 57 inch that’s how big this shelf unit is. Holds up to 120 lbs
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 8, 2026
S
Verified Purchase
Steven Knipp
Carnegie, US
★★★★★ 5
So many uses for this shelves
Easy to assemble and true to size i use mine as an mini Rc crawler display. Very sturdy and cleans well.
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Reviewed in the United States on February 14, 2026
P
Verified Purchase
P. Hinze
Bozeman, US
★★★★★ 5
Will probably buy another one!
Size: 7.9"D x 39.4"W x 34.3"H, Color: Black, Size: 7.9"D x 39.4"W x 34.3"H, Color: Black
Looks great, LED strip is a nice touch. The unit is relatively lightweight while still being quite sturdy. There were a lot of parts and it took some time to assemble, but the instructions were very clear - just step-by-step drawings but everything was labeled clearly. I was pleasantly surprised that the hardware that is used to put it together is better than you’ll often find with low-cost shelving and furniture too, which gives you confidence while assembling. Just don’t over-tighten anything to avoid cracking or stripping the parts.
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Reviewed in the United States on January 26, 2026
B
Verified Purchase
#BISkuTluV43
Phoenix, US
★★★★★ 4
Nice product, wall mounting could be easier
Size: 7.9"D x 39.4"W x 34.3"H, Color: White
Easy to put together, nice finish. Missing a star cause mounting it to the wall is a lil more difficult than it should be. I would never use the wall anchors to mount this
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Reviewed in the United States on February 23, 2026

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