Model 5600 1” and 2” Heavy-Duty Regulator Regulator ... The Model 5600 is a spring-loaded, self-operated pressure regulator, available in 1” and 2” sizes and built to withstand the most difficult processes and environments. It is offered in both low-pressure and high-pressure constructions, and is designed for inlet pressures up to1500 psig and outlet pressures from 3 to 500 psig.