Using a part not calibrated to the exact 0

This usually indicates the switch is not detecting the required 0

Relying on 40-400-02M technical specifications guarantees exact tolerances for high-demand hydronic and potable water applications

or erratic blower operation

Precision Alignment: Engineered to hold burners in the exact factory-specified position for optimal combustion and heat transfer

Armstrong Fluid Technology AS1270-259 O-Ring 340793-762 Using a part not calibratedEnsure leak free performance in your HVAC or fluid management system with the Armstrong Fluid Technology AS1270 259 O Ring. This genuine EPDM rubber suction guide seal is specifically engineered to fit the cover assembly of Armstrong SG 55 and SG 65 suction guides, as well as SGG and SGHH models. Measuring exactly 6. 234" ID x 0. 139" CS, this precision molded component provides a high integrity seal for 5 inch pump side connection suction guides. The