Hobbs Adjustable Pressure Switch
7psi. Normally Closed

These switches prevent your nitrous system from engaging when the fuel pressure is below a safe level. These easy-to-install versions for all carburetor and direct port nitrous systems are preset at 4 psi and are adjustable from 4 to 7 psi. For EFI applications, NOS offers safety switches preset at 50 psi that are adjustable from 30 to 70 psi.