this is a natural gas orifice

Smith commercial boiler and water heater lineups

Engineered to replace discontinued or superseded models like the B94578700 and CAP050300440CS

When the internal plenum temperature reaches the 160°F high-limit threshold

for the collar to ensure a hermetic seal

Lochinvar & A.O. Smith TST2900 Temperature Controller Els PW 29614 this is a natural gasThe Lochinvar & A. O. Smith TST2900 Temperature Controller (cross referenced as part number 100170632) is a critical OEM immersion thermostat designed for high recovery commercial water heating applications. This direct acting temperature control provides precise thermal regulation for Lochinvar Copper Fin and A. O. Smith Conservationist series units. Engineered with a rugged sensing bulb and capillary assembly, the TST2900 ensures accurate setpoint