Pyrex Slowcook Casserole Red 3.6L (Ø24cm) The Pyrex Slowcook Casserole Red 3.6L (Ø24cm) is a traditional pan, but has all the modern conveniences. Namely, it can be used on all heat sources, it can go in the oven up to 280 degrees and is even dishwasher safe. The pan retains heat well. Perfect for preparing various dishes, such as stews or other stews.