These 2 hardlines are custom made so you can bolt on a Wilwood adjustable proportion valve into your Nissan Datsun brake hardline system. These are required on all Japanese cars because the prop valve will leak fluid without these hardlines in between. Each line has a bubble flare and inverted flare on each side. This listing is for 2 pieces of hard lines, One pieces is 12 inch and the second is 18 inches long.
you will also need double female fittings to complete the prop valve installation.
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Didn't have to go buying more material than I needed and tools that I would seldom use to fabricate the lines .And the install was simple and easy.