013-21778, Sealing washer used on the HR, TS/TR, TX, LPA, LPW, ST, SR model engines, used to seal the hoses onto the oil filter housing. This is a very common used copper washer, especially for the oil drain plugs.
They measure this washer at 1/2 inch
This will be item number 8 on the Lister Petter HR2 drawing
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