this is specifically an HSI (Hot Surface Ignition) module

If your application does not require a pilot indicator

this gasket fits standard 2-bolt flange patterns used in various commercial hydronic circulators matching the ARM1013 specification

The Aaon R90510 is a high-reliability 24V DPDT Power Relay engineered for heavy-duty switching in commercial HVAC applications

This relieving type regulator includes dual 1/4" NPT gauge ports for flexible monitoring and a high flow capacity of approximately 150 SCFM

Setra 2651005WDABT1C Pressure Transducer 30067439-890 this is specifically an HSIThe Setra 2651005WDABT1C is a professional grade low differential pressure transducer engineered for precision monitoring in HVAC systems and VAV box control. This unit provides a 0 to 5" WC unidirectional pressure range, delivering highly accurate readings essential for maintaining static pressure and industrial airflow requirements. As the direct replacement for DPT2650 005D AB, it ensures seamless integration into existing building automation