Holley Fuel Pressure Regulator.

Aeroline Classic Car Carb Fuel Pressure Regulator Inline 1-5 Psi 8mm / 5/16"

Universal Fuel Pressure Regulator, 7 BAR Adjustable, Gauge & Accessory IN Silver

Sytec Motorsport Adjustable Fuel Pressure Regulator Injection 8mm - Blue

Universal Adjustable Fuel Pressure Regulator with Gauge

Tomei Fuel Presure Regulator FPR + Gauge - Type L - GREY - Like Sard

MALPASSI ALLOY FILTER KING 85mm FUEL PRESSURE REGULATOR + GAUGE KIT 1.5-7 PSI

Malpassi Filter King Adjustable Fuel Pressure Regulator/Filter 67mm Glass Bowl