B-3325-02-02 - 1/8" x 1/8"
B-3325-04-02 - 1/4" x 1/8"
B-3325-04-04 - 1/4" x 1/4" 
B-3325-06-02 - 3/8" x 1/8"
B-3325-06-04 - 3/8" x 1/4"
B-3325-06-06 - 3/8" x 3/8"
B-3325-08-04 - 1/2" x 1/4"
B-3325-08-06 - 1/2" x 3/8"
B-3325-08-08 - 1/2" x 1/2"
B-3325-12-08 - 3/4" x 1/2"
B-3325-12-12 - 3/4" x 3/4"
B-3325-16-16 - 1" x 1"

This brass hydraulic pipe fitting adapter is equivalent to the following:
-SAE 130137
-Eaton Weatherhead 3325