Preventing oil leaks for top end oilers, oil coolers. 14MM ID. This is the cheapest source I have found. I needed 14 from my ED (top end oiler, oil cooler, oil sump plug, side plug where oil pressure guage would go).
These work a charm
14mm => 9/16" => -6AN
Sealing Washer 14mm ID, Rubber Seal$2.00

Click to Enlarge12 or 14mm plated steel washer with Vamac Rubber vulcanized seal for dead-nuts, guaranteed sealing. Use with oil, fuel or pressure fittings, etc.
http://www.034motorsport.com/product_info.php?cPath=40_56&products_id=233
Or from Earl's
http://www.mpsracing.com/products/Earls/PA_Seals.asp
The low down: The Dowty's are a little more expensive and smaller. I would use them where you are worried about apperance
These work a charm
14mm => 9/16" => -6AN
Sealing Washer 14mm ID, Rubber Seal$2.00
Click to Enlarge12 or 14mm plated steel washer with Vamac Rubber vulcanized seal for dead-nuts, guaranteed sealing. Use with oil, fuel or pressure fittings, etc.
http://www.034motorsport.com/product_info.php?cPath=40_56&products_id=233
Or from Earl's
<H1 class=productGeneral id=productName>Dowty Seal, 9/16” I.D., Fits 6 AN Fitting
$5.25 Package Of 2
http://www.mpsracing.com/products/Earls/PA_Seals.asp
The low down: The Dowty's are a little more expensive and smaller. I would use them where you are worried about apperance
Stat-O-Seals
The Stat-O-Seal is very simply the best sealing washer available. It consists of a synthetic rubber "O" ring mechanically locked to the I.D. of an aluminum washer. When tightened the "O" ring is compressed, forcing the sealing surfaces around the bolt shank. They will form a positive seal over a temperature range of -85? to +450? F. They provide the advantages of an "O" ring type seal without the necessity of machining "O" ring grooves into the part. In any application where you are now using a copper or aluminum sealing washer, the Stat-O-Seal will do a better job.
Dowty Seals 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.
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