Contamination Protection: Dual metal shields (ZZ) provide a physical barrier against particulates while securing internal lubrication

022" NG orifice fits standard 3/16-inch tubing or 1/4-inch adapters

Is the 272708A different from the 272708A/U

as long as the diameter

Williams P213400 Switch Contamination Protection: Dual metal shieldsThe Williams P213400 Fan Selector Switch F160 30F is a critical OEM spec replacement component engineered for high performance direct vent and gravity wall furnaces. As a primary HVAC blower control switch, this unit facilitates precise multi speed fan regulation to maintain optimal thermal distribution and equipment efficiency. Designed specifically as a Williams furnace replacement part, the F160 30F integrates seamlessly with Williams models