This bored-to-size (BTS) flange features a 1-inch bore with a standard 1/4" x 1/8" keyseat

it protects against system shutdowns triggered by pressure switch trips and prevents corrosion within the heat exchanger cabinet

Direct OEM Fitment: Replaces York S1-2702-3191 and fits popular furnace models including 6MG04 and 6MG03

This unit features a high-precision 10K Ohm Type III thermistor sensing element

Cleveland Controls DFS-221-227 Switch This bored-to-size (BTS) flange featuresThe Cleveland Controls DFS 221 227 is a precision engineered airflow proving switch specifically designed for duct heaters, ovens, and energy management systems. This fixed set point air pressure switch is factory calibrated to operate on a pressure rise at 0. 05" 0. 02" w. c., making it a reliable solution for applications where a non adjustable, tamper proof sensing component is required. Built with a durable plated housing and a high performance