B-3300-02-02 - 1/8" x 1/8"
B-3300-04-02 - 1/4" x 1/8"
B-3300-04-04 - 1/4" x 1/4"
B-3300-06-02 - 3/8" x 1/8"
B-3300-06-04 - 3/8" x 1/4"
B-3300-06-06 - 3/8" x 3/8"
B-3300-08-04 - 1/2" x 1/4"
B-3300-08-06 - 1/2" x 3/8"
B-3300-08-08 - 1/2" x 1/2"
B-3300-12-08 - 3/4" x 1/2"
B-3300-12-12 - 3/4" x 3/4"

This brass hydraulic pipe fitting adapter is equivalent to the following:
-SAE 130138
-Eaton Weatherhead 3300