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Based on your erected 9in length, and your pumping needs at 3in in diameter, which is in reality around 2.85in or maybe 2.90in inner diameter, your
cylinder needs is around 12in length and around 3.25in in diameter.
If you click on the Sizing, the
cylinders options for you are:
9.25in in length and 3.25in in diameter, which falls far short of the 12in buffer head space you need.
@DLD can you confirm if there's a longer length for the larger diameter from the sales department?
Since we may not have the
cylinder in stock, I will reroute you to the source that can. LeLuv has a 12in x 3.25in overall (or 3.10in inner) diameter. The next size up is the 12in x 3.5in
cylinder.
I used to favor Doc Johson for replacement
cylinders as well, but the quality and redesigns dropped in my perspective. However, I rather moved on with either LeLuv or LA Pump
cylinders. Either will give you crazy selection on length as well.
The blurry redness, not sure if they are pre-blister since the photo is unclear, is an indicator of over-pressure. Not sure what pressure you're at, but again, you're exceeding the glan's conditioning capacity to handle such as high pressure. Ease back.