Part # 15719. They are manufactured from aluminum and are black anodized for protection against corrosion. Simply screw the EFI nozzle into the adapter and then mount them securely to the intake manifold.
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15719 Nitrous Express EFI Nozzle Adapter Fitting for Shark Nozzle
Nitrous Express 15460, One Black Aluminum Nitrous Carb Burst Plate 4500 Series
