On Fri, 23 Oct 2009 10:23:17 -0700 (PDT), Judith in France
 wrote:

>I am wondering, please don't sigh... is the gasket the
>metal thingy which hisses 

That is the 3 part  weight, it has no rubber bits.

>or the safety thing; 

That is the err... safety thing   If the rubber surrounding it  feels
very hard and it continues to hiss and bubble when the cooker is up to
pressure it is also worth replacing.  The whole rubber bit  simply
pushes out from inside the lid.  

>or the rubber seal round the rim?

That is the gasket.

On Fri, 23 Oct 2009 19:31:19 +0100, Peter Parry  wrote:

>On Fri, 23 Oct 2009 10:23:17 -0700 (PDT), Judith in France
> wrote:
>
>>I am wondering, please don't sigh... is the gasket the
>>metal thingy which hisses 
>
>That is the 3 part  weight, it has no rubber bits.
>
>>or the safety thing; 
>
>That is the err... safety thing   If the rubber surrounding it  feels
>very hard and it continues to hiss and bubble when the cooker is up to
>pressure it is also worth replacing.  The whole rubber bit  simply
>pushes out from inside the lid. 

On both our Prestige pressure cookers this bit needed replacing long before the
rubber ring/gasket.
 
>
>>or the rubber seal round the rim?
>
>That is the gasket.  
-- 

Martin