Standard practice in the U.S.A. is to use crush washers, “O” rings and/or Stat–O–Seals to seal ports and banjo fittings. English practice is to use “Dowty Seals”. Dowty 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 Dowty Seals.
Dowty Seal, 7/8" I.D., Fits 10 AN Fitting, Package Of 2