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Selecting the proper cylinder size is important for
making your pumping sessions both comfortable and rewarding.
Your cylinder should be large enough to allow for significant
expansion, but not so large as to make it easy for your
testicles to be drawn into the cylinder by the
vacuum.
When selecting length, choose a cylinder that
is between 2 and 3 inches longer then your bone pressed erect
length.
For selecting diameter, use the table
below.
| Base Girth |
Cylinder Diameter |
| 3.50 to 4.50* |
1.50 |
| 4.75 to 5.25* |
1.75 |
| 5.50 to 6.00* |
2.00 |
| 6.25 to 6.75* |
2.25 |
| 7.00 to 7.50* |
2.50 |
| 7.75 to 8.25* |
2.75 |
*If you
are at the upper limit and are going for length, select the
cylinder diameter straight across in the table. If you are at
the upper limit and are going for girth, select the next
cylinder size up. Example: Your base girth measures 5.25. If
your goal is length, select the 1.75 cylinder. If your goal is
girth, select the 2.0 cylinder.
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