Durable and versatile intelligent Lid with Pot Mat makes an Airtight lid to various Pots. Sits flat and nicely on pots and pans- ideal for pasta, vegetables, potatoes, eggs and more. Detachable Valve: opens automatically at boiling temperature and closes automatically when content goes back to room temperature. It has high heat resistant silicone tight seal that fits on pots and pans from 18-24 cm, with three colors. Circle-shaped knob provides a secure, slip-free grip when placing or removing the lid. Dishwasher safe. An excellent addition to your vintage kitchen collection.