this part facilitates sequential firing and circulator operation based on thermostat demand

Field adjustments should always be verified with a draft gauge

As the official direct replacement for 11091204S and 10219603S

a different orifice and assembly configuration are required to ensure safe combustion

Conbraco 4A-004-10 Complete Internals Refrigerant this part facilitates sequential firingThe Conbraco 4A 004 10 Complete Internals kit is a high grade OEM solution for servicing 3 4" Apollo 4A 200 Series Reduced Pressure Zone (RPZ) backflow preventers. This comprehensive RP complete internals package is engineered to restore the structural integrity of backflow prevention assemblies, ensuring continued protection against back siphonage and backpressure in critical potable water systems. The kit features modular check valve cartridges