Perfect Compatibility: Designed to replace the Vaillant boiler auto air vent (part number 061707) for a seamless fit. Improved System Efficiency: Prevents airlocks and ensures optimal water flow within the system for consistent heating and hot water performance. Durable Construction: Made from high-quality materials to withstand the demands of continuous heating cycles. Easy Installation: Engineered for quick and hassle-free installation, reducing downtime and restoring your boiler’s full functionality. 12-Month Warranty: Comes with a 12-month warranty for added peace of mind and confidence in its reliable performance., Manufacturer: HTS