WMF Perfect Ultra Replacement Lid Handle. The handle is compatible with all pressure cookers in the Perfect Ultra series with diameters of 18 and 22 cm (2.5 l, 3.0 l, 4.5 l, 6.5 l, and 8.5 l). The WMF Perfect Ultra pressure cooker features innovative design and maximum ease of use. This is primarily ensured by the All-In-One control knob on the handle: opening and closing, selecting the cooking level, and the steam release automation - all are managed through this central control element. The gentle steam release automation of the WMF Perfect Ultra allows steam to escape softly, making it easy and safe to open the pot. Thanks to the flame protection on the pot and side handle, the WMF Perfect Ultra is also suitable for use on gas stoves. To ensure long-lasting enjoyment of your steam pot, the WMF Perfect Ultra is made from durable Cromargan. Convenient cleaning is also taken care of: the handle is detachable, and both the pot and lid are dishwasher safe. Four different sizes of pots, a frying pan, and two sets are available.