The Gen 2 30F is slightly larger in diameter than a PT65. Wedge F tuba cups are similar to a PT65 cup. They have a shallow, modified V shape, which provides an excellent balance of clarity and projection with an even response in all registers and a round, full tone.
ID: 1.30 inches at .05 inches into the cup (33.02 mm)
0D: 1.90 inches (48.26 mm)
Throat: .310 inches (7.87 mm)