Lochinvar & A.O. Smith 100291510 Cartridge 319825-402 Always verify your specific model

Always verify your specific model and serial number against the manufacturer’s parts list to ensure the correct staging logic

We recommend inspecting the mounting surface and using a high-temp silicone sealant or a new mounting gasket during installation to ensure a gas-tight seal at the collector box

extending the service life of the solenoid assembly

always verify your specific system requirements during installation

Lochinvar & A.O. Smith 100291510 Cartridge 319825-402 Always verify your specific modelThe Lochinvar & A. O. Smith 100291510 Cartridge is a critical OEM maintenance component designed specifically for the PP AS20 Product Preservers anti scale system. As a veteran technician knows, hard water scale acts as a thermal insulator, significantly reducing heat transfer efficiency in tankless water heaters and boilers. This replacement antiscale cartridge utilizes a specialized media blend that chemically sequesters scale forming minerals like