Lochinvar & A.O. Smith 100191014 Gasket 320788-704 the T-4000-3145 is the "no

the T-4000-3145 is the "no thermometer" variant

Mechanical Precision: Features an integrated "Off" position for manual system shutdown during maintenance or defrost cycles

capable of maintaining damper position at temperatures up to 450

A critical component for maintaining system uptime

ensuring long-term operational stability in the field

Lochinvar & A.O. Smith 100191014 Gasket 320788-704 the T-4000-3145 is the "noThe Lochinvar & A. O. Smith 100191014 Gasket is a critical manifold gasket kit engineered specifically for high capacity boiler manifold sealing. Designed for professional use in FBN4000 and FBL4000 models, this OEM kit ensures a high integrity seal between the manifold door and the combustion chamber. As a veteran grade HVAC replacement part, it is purpose built to maintain precise system pressure and prevent dangerous gas or combustion leaks. The