My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Earl's Performance 00121ERL Hardline Adapter 1/2-20 to 5/8-18 Inverted Flare Stainless Steel

Part of: Earl's Performance Hardline Adapter Fittings

Other options in this family: Earl's Performance 02032ERL Earl's Performance 00124ERL Earl's Performance 02076ERL Earl's Performance 00114ERL Earl's Performance 02102ERL

Manufacturer

Picture for manufacturer Earl's Performance

Part Number

00121ERL
9 reviews
Sale Price

$16.39

In Stock (10+)

delivery box

Usually delivered within 2 days

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Earl's Performance 00121ERL is a precision hardline adapter fitting designed for use with copper, brass, aluminum, and welded steel hydraulic tubing. This reducer fitting features a straight configuration with 1/2-20 inch male inverted flare connection on one end and 5/8-18 inch female inverted flare on the other, specifically sized for 3/8 inch tubing applications.

Key Features:

  • Stainless steel construction helps prevent corrosion and provides a solid, consistent seal
  • Natural finish for a clean, professional appearance
  • Non-swivel design for secure connections in fixed applications
  • Ideal for use with stainless steel, steel, and easy form tubing
  • Precision-machined inverted flare threads ensure leak-free performance

This hardline adapter is perfect for brake line modifications, fuel system upgrades, and custom hydraulic plumbing projects where you need to transition between different inverted flare sizes. The durable stainless steel construction ensures long-lasting reliability in demanding automotive, racing, and custom fabrication applications.

Products specifications

Adapter Size ( A )

1/2-20 I.F. Male

Adapter Size ( B )

5/8-18 I.F. FEMALE

Adapter Type

Hardline Adapter

Angle

Straight

Brand

Earl's

Category

Air and Fuel Delivery

Emission Code

5

Finish

Natural

Material

Stainless Steel

Part Type

Fuel Hose Fitting

Product Line

Premium

Product Type

Hardline Adapter

Quantity Per Pkg.

1

Sub Category

Hardware, Fasteners and Fittings

Thread

1/2"-20

Tube Size

3/8 Inch

Warning

California Proposition 65

purchased chrome tailpipe extension - very nice product

Great and Easy to Use Website

smooth

Super Easy !!!!!!

Easy to place order

the first 2 times I tried to check out, there were website errors. After that, though, it was smooth and easy. easy to find what i wanted. best price i saw anywhere!

good site,ordered monday recievied thursday

THE EASIEST AND FASTEST SHOPPING I HAVE EVER DONE.THANKYOU

Everytime I went back because I wasn't sure yet, then proceeded, it added another purchase. Have to press "go" after purchase everytime.

Share icon
Return Policy
Returns are easy at THMotorsports

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy