PORTS AND FITTINGS
The fuel rail ports are tapped for 8AN ORB.

8AN ORB Adapter Fittings 
8AN ORB Direct Mount Regulators
8AN ORB Fuel Pulse Dampers
Fuel Pressure Gauge Adapters

COMPATIBILITY
This fuel rail has been confirmed to work with the following Honda engines: H22A1, H22A4, H23A1, F20A, F20B, F22A1, F22A4, F22A6

OVERVIEW
Manufactured with a large internal bore, the fuel rail can support all necessary engine power requirements. They are CNC machined from 6061 aluminum, anodized, and laser etched for a high quality surface finish. Like the OEM fuel rails, the injector bores are 11mm ID so factory injectors, or any equivalent aftermarket injector, can be used. 

FUEL INJECTOR COMPATIBILITY
This fuel rail is compatible with factory or OEM equivalent fuel injectors. If upgrading fuel injectors, consult your aftermarket injector supplier for details. Radium Engineering cannot specify any further injector dimensions other than stating ‘OEM equivalent’.

20-0870-PK Fuel Rail Plumbing, Honda F-H-Series
The plumbing kit includes the items shown in the image below and allows easy hookup to the factory feed line. It is intended to be used with the factory pressure regulator, but can also work with an aftermarket regulator.

Instruction PDF