Holley continues to innovate products that make the life of a hot rodder easier! Inline fuel filter and bypass pressure regulator simplifies routing your fuel supply line to the EFI fuel rails. Easily mounting the filter/regulator in the rear of the vehicle will make running a return line much shorter. The aluminum assembly contains a 175 GPH, 10 Micron filter and a regulator preset at 59.5 psi. The filter regulator comes in 3/8 in. NPT or -8 AN O-ring port sizes to match most EFI fuel systems.