This is our Oversized Standard Vacuum Developer with trigger pump (with gauge), oversized 8" cylinder and seal set. Note that the exact design of the trigger pump may vary slightly from the image. Our Oversized Standard Vacuum Developer has an 8" cylinder but with a slightly wider bore (2 1/2") which is carried right up through the length of the cylinder. Perfect for those with a wide girth at the base of the penis or a large glans. A handy measure is etched into the cylinder. This version comes with a trigger pump with a guage.