often referred to as the See-All sight glass

separate pilot burner and flame sensor configurations

this Fenwal replacement part features a professional-grade 1/4-inch female quick-connect terminal with a fully insulated design to prevent voltage leaks and ensure peak dielectric strength

Universal Frequency Support: Built to operate reliably across both 50Hz and 60Hz cycles

Johnson Controls A19ABA-4 Utility Thermostat 30067439-890 often referred to as theThe Johnson Controls A19ABA 4 Utility Thermostat is a rugged, single stage remote bulb temperature control engineered for high accuracy cycling in commercial refrigeration and HVAC systems. Designed with a liquid filled sensing element, this controller maintains precision "repeat" accuracy regardless of barometric pressure or cross ambient temperature fluctuations. The A19ABA 4 features a broad 120 208 240 Vac compatibility and SPST (Single Pole