wstar, you should be able to measure it, AN measurements mean how many 1/16 of an inch, and measure the inner diameter of a hose, so
#2 =1/8”
#3 = 3/16”
#4 = ¼”
#6 = 3/8”
#8 = ½”
#10 = 5/8”
#12 = ¾”
#16 = 1”
#20 = 1 ¼”
#24 = 1 ½”
#32 = 2”
#40 = 2 ½”
#48 = 3”
#64 = 4”
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