Fuel Regulator Billet (Return Style)

Billet FP Regulator 4.5-9 PSI (Bypass style) 

 This Holley Regulator requires a return fuel line to be installed and run back to the tank. 

3/8" NPT Ports 

Holley 12-840 is a 2-port design "Dead Head" style fuel regulator with NPT (Tapered threads)

Use Speedflow adapters: 

816-06-06 adaptors for 5/16 or 3/8 hoses.

816-08 for 1/2" hose.