Armstrong 57M66 Furnace Pressure SwitchArmstrong 57M66 Furnace Pressure Switch is a dependable control device for your heating system. This furnace pressure switch functions as a safety interlock, confirming proper venting and gas pressure before ignition, and it serves as a reliable type of pressure switch designed for use on furnaces. Used On Furnace and part of a standard furnace control circuit, this switch helps prevent unsafe starts and supports consistent furnace performance when

3/8 inch Female Threaded x 3/8 inch Female Threaded pipe connections

ensuring consistent burner performance

CSA and NEC compliant: designed for safe North American installation

easy identification

This 16-inch burner door assembly is built for natural gas systems and compatible with AO Smith models GS6

Mounting: vertical/upright installation

Operating Voltage: 120V AC

delivering precise flame detection and stable ignition

7 A @ 240 VAC

and boiler systems

offering a straightforward replacement part for aging valves

Probe-type electronic low water cutoff for precise water level sensing