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3/8" Delta washers don't appear to exist, I've just searched hundreds of pages.
According to this site a 1/2" Delta is 15.5mm;
1/2" Delta Tap Washer - Stevenson Plumbing & Electrical Supplies
According to this site a 1/2" Delta is 15.5mm;
1/2" Delta Tap Washer - Stevenson Plumbing & Electrical Supplies