DOOR GASKET
I had the same issue with my 1947 Bendix washer.Then an idea hit me.I went down to the local bike shop and got a small inner tube.The size was 9" or so I cannot remember.Anyway,I just cut the valve out and slipped it on.Problem solved.Water tight.No leaks.Used it like that for years.And its still on there.I just googled small inner tubes and there are a ton to choose from.And super cheap.Hope this can help you.,John