This is a 3D printable adaptor to add a 22mm ID ISO taper connector to any Seac Sub full-face snorkeling mask. This connector can be used to attach a medical breathing filter, to make an effective full-face respirator for healthcare workers when conventional respirators are not available.

In addition to this adaptor, a 1 inch o-ring is necessary to ensure an airtight seal the snorkel mask. The o-ring fits into the notch in the adaptor