I cook daily in a pressure cooker so this product is very important to me. I have a Hawkins 2 liter cooker, prestige 3.5 liter and a presto 6 quart pressure cooker but they are all aluminum. I've had the presto 6 qt aluminum for at least over 6 years. It works very well. The best thing about it as compared to Hawkins and Prestige is that it doesn't let pressure off in loud installments (which scares the kids), its more like a consistent whistle.