TRIAL ASSEMBLED All SPD fuel pressure regulators is delivered pressure tested. This BTR is only recommended to customers with very high power outputs running especially for those running ethanol and methanol fuels. Ethanol fuel systems that are built for about 1000hp or less, we recommend the SPD V2 regulator. The SPD2000 fuel pressure regulator is specially designed for very powerful fuel systems. The regulator is designed to control large fluctuations in fuel flows quickly. It can handle high return flows at low load on the engine and raises the fuel pressure 1: 1 with the charge pressure. Works with both ethanol and methanol fuels. The diaphragm is recommended to change every season. This  is one of very few FPR's on the market which does not leak air at the adjusting bolt. Built-in top screw sealing kit that is pressurized and tested up to 7 bar air pressure without leaking. 1/8" female NPT thread at the front to connect fuel pressure sensor or fuel gauge. 1/8" female NPT thread fo