The Green Fisher Propane Regulator is the 2nd stage propane gas regulator for the Pest Heat TPE-500 Propane Heater. It reduces the gas pressure to 5 psi. The TPE-500 has a total of 4 propane regulators for a cleaner burn without bursts of flames escaping the front of the heater. Order your replacement part to get back to heat treating bed bugs today.