the Q101 protects the heat exchanger and improves airflow delivery across the coil

This seal is designed for 2/1-4"-12 thread Rotalock connections

The 44L72 is functionally equivalent to part number 44L7201

Concealed Adjustment

or clogged condensate drain lines creating backpressure

Weil Mclain 383-500-600 Sensor Kit Els PW 17895 the Q101 protects the heatThe Weil McLain 383 500 600 Flue Temperature Sensor Kit is a critical monitoring component designed specifically for Ultra Series 3 and Commercial gas boilers. This OEM replacement kit includes a high accuracy dual sensor and a fresh sealing grommet to ensure airtight installation in the stainless steel vent pipe. As a veteran technician knows, maintaining precise exhaust thermal data is non negotiable for boiler safety and efficiency. This sensor