Standard practice in the USA is to use crush washers, O rings and, or Stat-O-Seals to seal ports and banjo fittings. English practice is to use dowdy seals. Dowdy seals are similar in concept to our Stat-O-Seals, but are considerably smaller in diameter (and thicker in cross section). Since many of our road racing and Indy cars- and their mechanics-are of English origin, Earl's offers a complete range of dowdy seals.