Shiley Phonate Speaking Valve (SSV) and Shiley Phonate Speaking Valve with for use with low flow oxygen. O2 Port (SSVO). Designed for use on alert, awake tracheostomy patients who can breathe without assisted mechanical ventilation. Connects to 15 mm connector on tracheostomy tube. Directs airflow past the vocal cords, helping enable patients to speak without finger occlusion.