GO FAST BITS FX-S FUEL PRESSURE REGULATOR FEATURES. 4x 1/8″ NPT body ports which can be used for any combination of fuel inlet/s or pressure gauge/ECU sensor, and 1x 1/8″ NPT return port. 1:1 fuel pressure rise rate. Double layer/double reinforced diaphragms with a burst strength exceeding 500psi. Teflon co-polymer seat with spherical stainless valve to retain fuel pressure longer after shut down. Spring pre-load adjustment screw is o-ring sealed and does not leak vacuum/boost. Static pressures adjustable from 25psi to 80psi.