slip-free interface with the drive shaft

All technical specs

This extends the service life of internal electronic components and reduces the strain on the 24V secondary transformer

It is designed exclusively for hot and chilled water applications in closed-loop hydronic systems

Direct Replacement: Serves as the factory-authorized update for the legacy Lochinvar VAL3213 part number

AERCO GP-18900 Seal 320734-701 slip-free interface with the driveThe AERCO GP 18900 Seal is a critical genuine OEM replacement part specifically engineered for high performance AERCO boiler parts and commercial water heating systems. This precise manifold to lower head seal is designed to create a robust, leak proof interface between the manifold and the lower head assembly, ensuring pressure integrity and thermal efficiency. As an authentic HVAC replacement seal, the GP 18900 prevents bypass leakage and maintains