Which boiler models use this specific turbulator

Contractors often report condenser chattering

this specific kit is precision-engineered only for the 1/2" 38-200 series

This kit is a direct replacement for Honeywell 393690-4/U and is engineered for high-performance sealing in residential and commercial gas heating systems

The T-4000-611 is a dual-temp adaptor

Johnson Controls AFS-405 Switch Which boiler models use thisThe Johnson Controls AFS 405 is a professional grade adjustable differential air pressure switch designed for precision monitoring in HVAC, DDC, and energy management systems. Engineered with a glass filled polycarbonate housing and a high performance silicone diaphragm, this sensing switch is optimized for detecting positive, negative, or differential pressure between 0. 05 and 12. 0 inches water column. The inclusion of gold plated contacts ensures