Looks to be pretty dangerous if it is a steam pressure or even a steam partial pressure cooker. Exploding pressure cookers can be lethal and scrapping 50lbs of 110C food off the kitchen ceiling even if it doesn't kill anyone would be really tiresome. If you need a large volume pressure cooker then it might be worthwhile getting a decent quality pressure cooker even if you have to pay double the price.

http://www.amazon.co.uk/WMF-Stainless-Pe...mp;sr=1-2-spell

The WMF 2.25 Gallon (8.5 litre) Pressure quality is German manufactured from 10/8 Stainless steel (far more robust than 1060 Aluminium) and can be used even with a highly efficient programmable induction hot plates for home use. A range of accessories such as trivet trays etc are available as well.