515/525 Series Fuel Pressure Regulators accept port style and non-port style union fittings without interference. Available in several configurations that support carbureted applications as low as 1 psi to fuel injected applications up to 125 psi.
Note: The 515 Series Fuel Pressure Regulator has a -6AN return port located on the bottom.
The 525 Series has its return port in-line with the inlet port (not on the bottom).

535/545 Series Fuel Pressure Regulators have all the same great features as the 515/525 Series, just smaller and 50% less weight.

555 Series Fuel Pressure Regulators are true precision instruments designed to regulate fuel. Featuring an advanced poppet design for smooth regulating capability adjustable from 4-12 psi. Includes a no-creep methanol and E85 compatible soft seat.
Note: 555 Series is Methanol only. Two -8AN outlet ports with one -8AN inlet port. Filtered breather vent included.

565 Series Fuel Pressure Regulators have all of the same great features as the 515/525 Series except for extreme capacity. Has 1/2" return orifice and -10AN ports with a bypass capability over 5 gpm at 5 psi and can handle blow through carbureted applications well over 1800 HP for EFI applications using belt driven fuel pumps. Available in four different pressure ranges covering applications between 4 and 80 psi.
Note: Two -10AN inlets, one -10AN return port; 1.75" sized diaphragm with 1/2" return orifice.