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The 1/2"-20 end has longer threads required to fit some OE (Original Equipment) and aftermarket Mopar and GM master cylinders. Most other adapters will bottom out before they seal on the inverted flare. Steel adapters are recommended on all brake systems since they are stronger and can handle higher pressures.
Earl’s Brake Adapter - 562047ERL
$34.82
Features:
- Fits Many Aftermarket Mopar and GM Master Cylinders w/ 1/2"-20 Inverted Flare Threads
Sizes and Connection Specifications:
- Product Details: Brake Adapter Thread Size -4AN To 1/2"-20 Inverted Flare Male - 2 Per Package - Steel w/ Electroless Nickel Plating.
- Adapter AN Size ( A ): 4 AN MALE (AN -4 thread: 7/16-20, 20 TPI)
- Adapter Port Size ( B ): 1/2-20 I.F. MALE
- Adapter Type: Brake Adapter