Universal Compatibility: Fits standard 3/4" NPT threads

reducing service time and preventing installation errors

maintaining combustion air proving standards across multiple equipment generations

offering a seamless fit for standardized burner mounting configurations

Laars Heating Systems E0088400 Relay R-448A Universal Compatibility: Fits standard 3/4"The Laars Heating Systems E0088400 Relay is a specialized 24V DPNO Lockout Relay engineered for critical safety sequencing in high efficiency boilers and water heaters. As a Double Pole Normally Open component, it provides essential circuit isolation and prevents unsafe operation by locking out the ignition sequence when a fault is detected in the control loop. Designed for compatibility with various Laars boiler parts, this relay is commonly found in