heard of a guy who was too thick for the pipe. And suction was strong, It pieled his dick like a banana, he got it out fairly fast as hid erection dispersed immediatly. Had to get it reattached at and plastic surgery. Followed by infection. His dick dont work the same anymore.
Id advise to buy a penis pump
There are a great number of variables on this one. Damage could result to two things one being the penis the second being the vacuum cleaner. The design of most tank type machines is such that the motor depends on the airflow of a partial restriction for cooling. Complete and total restriction and the creation of a vacuum in this manner completely stops air flow over the motor and hence it begins to overheat and the armature will begin to throw solder. This can result in failure of the motor and there is slight potential for a direct short depending on the design. Not a great idea. . . . .