People sell gaskets on ebay. Take the gasket out and measure the diameter. I bought a gasket set containing the required size for about £10.00 (with 500 gaskets) and one size fitted perfectly. This was cheaper than buying one gasket. Before fitting, clean out the groove with the end of a spoon or a knife. Then the gasket will fit correctly.
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People sell gaskets on ebay. Take the gasket out and measure the diameter. I bought a gasket set containing the required size for about £10.00 (with 500 gaskets) and one size fitted perfectly. This was cheaper than buying one gasket. Before fitting, clean out the groove with the end of a spoon or a knife. Then the gasket will fit correctly.