| http://www.w3.org/ns/prov#value | - The cover 5 which is made of thermally insulating material such as a hard, high melting point thermoset resin material, comprises an inner funnel-shaped portion, an outer sleeve portion having an outwardly directed lip which is snap fittably received in the annular groove in the lining, and an intermediate portion extending between the inner and outer portions.
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