The Zeal petal shaped silicone anti spill lid works by acting as a cooling surface for the hot liquid. When the froth and boiling liquid spills up and over onto the lid, it then cools as it touches the silicone then running back into the pan. This makes it almost impossible for it to boil enough to allow any spills onto the worktop. Leave your pan without any worries of boiling over creating messy cookers, hobs or stove tops. Designed to prevent milk, vegetables, rice or pasta from boiling over while cooking. It is the perfect spill guard, preventing overflow of boiling liquids or milk by simply placing the lid on the saucepan or milk pan while it is cool, and so when hot liquids or milk boils up onto this silicone ring its unique design prevents all spillages or overflows. A great kitchen gadget, universal fit makes it compatible with a range of saucepans or pots, from 15cm milk pan through 16cm, 18cm, 20cm, 23cm all the way to large 25cm saucepans. Suitable for all hobs including Aga stoves. Part of the Zeal reflecting nature range of kitchen utensils, this stylish boil over guard makes a perfect gift for the cook who wants no spills! The Zeal petal boil over guard made of silicone and is heat resistant to 250°C/482°F, it is easy to clean and dishwasher safe. Zeal specialise in designing and developing the most useful, premium quality functional and durable kitchen products. Every detail of the product and its use is scrutinised to create products you will want to rely on and use every single day.