the PC-07-0202 is the internal replacement diaphragm only

this OEM part is the standard replacement for various Source 1 applications within the Johnson Controls family

and GM types

and Nortek furnace limit control applications

While the 30041050-835 can be replaced individually to address seat leakage

Victor G150-60-540R Oxygen Regulator Els PW 17895 the PC-07-0202 is the internalThe Victor G150 60 540R Oxygen Regulator is a heavy duty, single stage tool engineered for precision gas control in demanding HVACR and welding environments. Featuring a rugged all brass construction, this regulator is built to withstand the rigors of field use while maintaining consistent flow rates. The unit is equipped with a 4,000 PSIG high pressure gauge for monitoring tank levels and a 100 PSIG low pressure gauge for accurate delivery,