this is the official updated part number and serves as a direct drop-in replacement for the 100166151 air pressure switch

It is not compatible with older standing pilot units

The Weil McLain 511-330-163 Pilot Assembly is a specialized OEM field replacement engineered for intermittent pilot ignition systems

This industrial air eliminator is essential for removing accumulated air and non-condensable gases

Resideo WT8840B1500 Gas Valve 321894-706 this is the official updatedThe Resideo WT8840B1500 Gas Valve is a professional grade standing pilot water heater control designed to replace legacy WV8840 series valves. Built for high performance Natural Gas applications, this control is a direct fit for AO Smith and Bradford White water heaters. It features a 1 2" NPT inlet and a 1 2" Inverted Flare outlet, and it is engineered for tanks with a 2" insulation cavity. The integrated NTC temperature sensor provides precise