AN hose size is measured inside the hose = (inner diameter of the hose). Depending on hose type, the outer diameter of the hose will vary. The type of hose technology has also changed since the Second World War when these connections came so the actual dimensions of the AN hose can vary. It also differs between manufacturers sometimes. So be sure to use the right hose for your AN hose ends and AN-system

PART NUMBER AN size DIA (inner) COLOR A806 AN 6 11/32 in. ~8.7 mm black A808 AN 8 7/16 in. ~11.1 mm. black A810 AN 10 9/16 in. ~14.2 mm. black A812 AN 12 11/16 in. ~17.4 mm. black A816 AN 16 7/8 in ~22.2 mm. black A820 AN 20 1 1/8in. ~28.5 mm. black All BLACKROCK LAB items that involve increases in power greater than those required by the highway code of the country of the user, are intended only for competitive use.
All BLACKROCK LAB disclaims all liability for any use of the product contrary to national standards.
PART NUMBER AN size DIA (inner) COLOR A806BL AN 6 11/32 in. ~8.7 mm black (blue marked) A808BL AN 8 7/16 in. ~11.1 mm. black (blue marked) A810BL AN 10 9/16 in. ~14.2 mm. black (blue marked) A812BL AN 12 11/16 in. ~17.4 mm. black (blue marked) A816BL AN 16 7/8 in ~22.2 mm. black (blue marked) A820BL AN 20 1 1/8in. ~28.5 mm. black (blue marked)
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