Similar features with the ISSPRO R4007-4, the Pressure Switch R4006-4 only differs from is that it is a normally open & heavy duty rather than closed.
It also has a 2 1/4 inches terminal blades, a setting of 4 PSI, and a 1/8 inches NPTF threading.
- Threading: 1/8" NPTF
- Terminal: 2 1/4" Blades
- Calibration: 4 PSI
- Normally Open, Heavy Duty