B-73-02 | 1/8",  0.08"
B-73-03 | 3/16", 0.135"  
B-73-04 | 1/4", 0.125"
B-73-04A |-1/4", 0.172"
B-73-05 | 5/16", 0.187"
B-73-05A | 5/16", 0.232"
B-73-06 | 3/8", 0.250"
B-73-08 | 1/2" , 0.372"
B-73-10 | 5/8", 0.500"
B-73-10A | 5/8", 0.483"
B-73-12 | 3/4", 0.562"

This brass hydraulic compression tube fitting adapter is equivalent to the following:
-Tompkins 73