Webasto Thermo 90 O-Ring | 431567

The Webasto Thermo 90 O-Ring seal is a precision gasket designed for the temperature sensor in Webasto water heaters. Crafted from high-quality elastomer, it ensures a tight, leak-free seal across Thermo 90, Thermo 90S, Thermo 90ST, Thermo 90ST Pro, and DW80 variants. This essential component maintains optimal sensor contact, guards against heat and coolant leaks, and supports reliable ignition and temperature regulation in mobile climate systems. Easy to install with minimal downtime, it helps extend heater lifespan by preserving consistent performance in varying vehicle conditions. Ideal for owners, technicians, and installers seeking a durable, OEM-compatible seal that restores factory accuracy and protects sensitive electronics from environmental exposure.