Go to LULU or any other shopping centers where they sell prestige pressure cooker and ask for a spare washer.All will be having the gaskets(washers) and safety valves.Check the name and size of your cooker and select the washer for the same. It will be on back of the cooker.like prestige deluxe 5L or prestige ultra 7.5l.Take the correct size washer and u can fix it urself.