snorkel breather(n = noun.artifact) breather, schnorchel, schnorkel, snorkel - air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time;
is a kind of air duct, air passage, airway
is a part of pigboat, sub, submarine, u-boat

breather, snorkel, snorkel diving, take a breather, water breather