Holley Fuel Pressure Regulator.

Holley 12-804 Adjustable Fuel Pressure Regulator w/0-15 PSI Gauge

Fuel Pressure Regulator, Gauge, Bracket, Holley Carburetor Fuel lines Kit NPT

Fuel Pressure Regulator, Bracket, Holley Carburetor Braided Fuel Lines Kit NPT

Summit Racing Fuel Feed Line w/Gauge, Holley 12-704 Pressure Regulator

Fuel Pressure Regulator, Gauge, Bracket, Holley Carburetor Fuel lines Kit NPT

Fuel Pressure Regulator, Gauge, Bracket, Holley Carburetor Fuel lines Kit USA

Fuel Pressure Regulator, Gauge, Bracket, Holley Carburetor Fuel lines Kit NPT