With improvements in prosthetic technology, more amputees are becoming involved in extreme sports and activities. This means various legs for each diverse activity. The Sergius PQR-15 from Sergius Industries is the first lower-extremity prosthetic quick release that requires no tools to operate. It is designed to simplify switching between leg types for amputees, without the need to change sockets. Prosthetists simply install the PQR-15 to the standard components already being used. The PQR-15 allows operation with the use of a single hand. The product is easily repairable, with all components removable and replaceable. The durable titanium structure is engineered to with-stand diverse activities.