The Tower 5.5 Litre Aluminium Pressure Cooker model T80207 is a very basic model, which only operates on one pressure, that is full pressure. The instruction book on this model is the let down, it is very poor, this needs to be re-written thoroughly by someone that understands this pressure cooker fully, and understands the basics of a pressure cooker. Referring to this instruction book, the whole of the instructions and some of the parts become extremely confusing within the context. There is a lack of trivets / baskets with this model, it only has one shallow basket with it, when it could comfortably use a deeper basket allowing more produce to be placed into the cooker. Customer service is okay once you have made contact, but the methods of making contact are poor, or indeed non-existant, as emails are never answered (I sent an email every day for a fortnight), the message box on the website is never answered (I sent out a few of these), and the telephone number given is a 0844 number, which cost me 40p for the two minutes and five seconds (2.05) I was on the phone to you, this being made up of one minute (1) of listening to music, then one minute and five seconds (1.05) of speaking to a young woman who was able to help me, and phoned me back to give me further information regarding the only working pressure of this cooker (the instruction book is confusing, leading one to believe that there is a possibility that there might well be three working pressures, the same as the old weight regulated pressure cookers, most notable made by the Prestige company). So to summarise, this pressure cooker is okay, but don't expect too much, you are probably better off keeping your old pressure cooker and re-newing the gaskets and valves etc.