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This 5-inch vent cap is a critical component of the exhaust vent system
ensuring the system resumes operation once internal temperatures return to a safe threshold
Built to restore factory-spec static pressure and CFM
While the installation of a control cover is straightforward
providing reliable flame regulation and safety shut-off protocols
Fulton Boiler 2-40-000420 Relay R-448A This 5-inch vent cap isThe Fulton Boiler 2 40 000420 Relay is a critical 120V low water safety relay designed for demanding steam and hydronic applications. As a genuine OEM Fulton replacement part, this component integrates directly with your boilers control circuit to provide precise low water cutoff (LWCO) monitoring and pump control. Maintaining proper water levels is essential to prevent dry firing and catastrophic pressure vessel failure; this relay ensures that if a