Precise Pressure Calibration: Rated for an 8-11 psi range to ensure accurate valve modulation

it must be replaced to restore system operation

and Johnson Controls actuators

This specific sealing component is compatible with Spirax Sarco B1H

Using the OEM York pressure switch is recommended to ensure the specific inches of water column calibration matches your unit's safety profile

Allanson 421-BT299 Transformer Els PW 17895 Precise Pressure Calibration: Rated forThe Allanson 421 BT299 is a heavy duty ferromagnetic ignition transformer designed for reliable high voltage performance in demanding oil burner applications. As a veteran grade service replacement transformer, this 120V ignition transformer delivers a consistent 10,000V secondary output at 23mA with a mid point ground configuration, ensuring a stable spark even in older recovery systems. Unlike standard units, the 421 BT299 is a universal oil ignitor