Brand new. 22mm. The Instinct Eco Magnetic Filter is a high-performance accessory designed specifically for central heating boilers. Made from durable metal, this compact filter is ideal for indoor mounting and boasts an impressive energy efficiency rating of A+++. With its sleek black colour and innovative design, this product is a practical and stylish addition to any home heating system, ensuring optimal performance and cost-effective heating. Ideal for those looking to upgrade their heating system with a reliable and efficient filter solution.