A release valve returns the prosthetic to its flaccid state
The Project The creator of the Project, based in Germany, began working with silicones and plastics in order to create a realistic, durable, and comfortable prosthetic for trans men. As a trans man himself, he became aware of some of the limitations of other prosthetic products, and has attempted to address those in the Project's development.
Please note: because these prosthesis are relatively long, they may not be suitable for smaller or average size men for everyday, flaccid packing purposes
The site offers a product called "Phase 4"--a very realistic-looking dick and testicles that can be worn both flaccid and erect. It is designed to be attached with medical adhesive at both the pelvis and at a very small area just below the tailbone. The prosthetic can become erect if you desire by pumping the balls until the shaft reaches full length and desired hardness.