WMF Perfect Ultra Replacement Part Timer for Pressure Cooker Lids 2.5l - 8.5l, Plastic. Timer for the Perfect Ultra Pressure Cooker. The WMF Perfect Ultra pressure cooker features a forward-thinking 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 integrated timer allows for precise cooking of food thanks to visual and audible signals. The gentle steam release automation of the WMF Perfect Ultra ensures that steam escapes softly, making it easy and safe to open the pot. With 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 cooker, 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.