I couldn't find a manual for you but I found the manufacturer's website so that you can contact them for a replacement.
https://www.getpressurepro.com/

BTW, I noticed that the informercial and website says that you can pressure can in that pressure cooker. That is actually not safe to do, there are no USDA-approved pressure canning processing times for electric pressure cookers. Here is a comsumer alert with details:
http://www.hippressurecooking.com/consumer-alert-no-pressure-canning-in-un-tested-multi-cookers/