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The rubber gasket in the lid between the lid and the pot? Yes, it is availible. Anyplace that sells the cooker should have the gasket. Type Mirro Pressure Cooker seal in the search engine and I think that will give you a source.
You install a new pressure cooker gasket by simply twisting out the old and twisting in the new. It is simple, but make sure it is not turned on.
A gasket is a seal. It is essential to a pressure cooker, as it is to ovens (both convection and microwave) and is designed to keep steam and heat from escaping from the pressure cooker, except as you choose to control the escape of steam and heat.
Curries
Keep it scrupulously clean and don't let the gasket dry out.
There has to be a gasket between the lid and the pot so that it will seal. It is not possible to machine a smooth enough surface on something like this for general use. It would make a pressure cooker much too expensive.
If your cooker won't build steam the gasket isn't sealing. Try taking the gasket out and oiling with vegetable oil and re-inserting it. Make sure it is totally even in the groove. If there are any gaps it won't build pressure.
You should not use a pressure cooker to bake in . You could use the bottom if you had to, but it will not build pressure without the gasket and the gasket should not be put in the oven. The gauge will not survive in the oven either. The older lids also had a lead blow-out plug and the newer ones, a rubber plug. Both will melt out in the oven.
The living well pressure cooker brand name offers the sale of separate parts due to damages or loss. The parts can also be purchased online sold as is or even brand new. Department stores that sell the living well pressure cooker can also sell parts for the cooker.
No, they have nothing to do with each other.
If you get a new engine it will have a new head gasket
I have a 4-quart SKY-LINE pressure cooker purchased in a mountaineering store in (probably) the early 1960. And yes, it still works very well. Unfortunately the rubber gasket that held the fusible plug has gone to the great kitchen in the sky. I have temporarily sealed the 5/8" hole with a rubber stopper, but that leaves only the pop-off valve to prevent over-pressurization. Can any one help me? John Geobuff@hotmail.com