Npt Ports 1 in. The regulator does not have threaded holes. The screws are self-tapping as they make the threads.
12-804 Adjustable Fuel Pressure Regulator with Gauge For Holley 1-4 PSI,3/8" NPT
12-804 Carburetor Fuel Pressure Regulator fit Holley 1-4 PSI 3/8 " NPT 1 in.2
Holley 554-102 100 PSI Stainless Pressure Sensor Plug & Play for Fuel 0-100 PSI
HOLLY FUEL PREASSURE REGULATOR/BRACKET 12803
Fuel Pressure Regulator For Holley 2 Port 4 1/2 to 9 PSI Carburetor 12-803
Holley 12-886 EFI PRESSURE REGULATOR Black Die Cast Fuel Regulator, 59.5 PSI
