Repurposing various available models of snorkeling masks as a non-invasive mean of improving oxygenation of COVID-19 patients through the breathing of oxygen-enriched air under Continuous Positive Airway Pressure (CPAP), providing a therapeutic option between standard oxygen delivery devices (e.g. low flow nasal cannulas, venturi masks, non-rebreather masks, high flow nasal cannulas) and limited resources for invasive ventilation.