This was off of a sprint car fuel system.
Universal Inline Black Low Pressure Adjustable Fuel Pressure Regulator 1-6 PSI
NASCAR WATERMAN BILLET ALUMINUM ADJUSTABLE FUEL PRESSURE REGULATOR W/ LINE #721
NASCAR WATERMAN BILLET ALUMINUM ADJUSTABLE FUEL PRESSURE REGULATOR W/ LINE #720
WATERMAN GM RACING FUEL PRESSURE REGULATOR-DRAG-RAT ROD-DIRT LATE MODEL-ASPHALT
Waterman Cable Driven Fuel Pump with Peterson Fuel Filter & Carbon Fiber Bracket
Universal Adjustable Fuel Pressure Regulator Gauge AN6 Pressure Regulator Kit US