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Join Date: Apr 2009
Location: Brunswick, Maine
Posts: 4,268
Bikes: 1948 P. Barnard & Son, 1962 Rudge Sports, 1963 Freddie Grubb Routier, 1980 Manufrance Hirondelle, 1983 F. Moser Sprint, 1989 Raleigh Technium Pre, 2001 Raleigh M80
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I have found "leather bicycle pump washer" online in N.O.S. You can measure-out your plastic piece and see if you can get one in that diameter.