PORTS AND FITTINGS
The fuel rail ports are tapped for 8AN ORB.
8AN ORB Adapter Fittings can be found HERE.
8AN ORB Direct Mount Regulators can be found HERE.
8AN ORB Fuel Pulse Dampers can be found HERE.
Fuel Pressure Gauge Adapters can be found HERE.
Appropriate fittings must be selected based on the specific application. Ample space around the fuel rail port(s) is necessary for larger accessories such as fuel pressure regulators, fuel pressure gauges, and fuel pulse dampers. To verify clearance, the dimensional drawings on the product pages can be used as a reference guide.
The Radium Engineering high flow secondary fuel rail is for the 13B-RE rotary engine originally found in the 1990-1995 Mazda/Eunos Cosmo. The aluminum fuel rail is anodized black for compatibility with all popular fuel types including E85. Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. Like the stock fuel rail, the rail features 11mm injector bores permitting the use of OEM fuel injectors (shown below). 
HERE. The extra center port allows additional fuel system accessories such as the OEM fuel temperature sensor (using 14-0421 shown below), a pressure transducer, Radium fuel pulse damper (shown above), etc. 
FUEL INJECTOR COMPATIBILITY
When the included insulating spacers and injector seats are NOT installed only OEM Mazda top feed fuel injectors can be used.
By installing the included injector seat adapters, aftermarket fuel injectors can be used, such as the part numbers listed below.
Injector Dynamics ID1050-60-11-14
Injector Dynamics ID1300-60-11-14
Injector Dynamics ID1700-60-11-14
Injector Dynamics ID2000-60-11-14
Injector Dynamics ID2600-60-11-14
