This is the Overpressure completely restored and rebuilt by Vintage double Hose. This regulator cannot be over breathed and in fact darn near will give you an over expansion injury in the garage! After having it restored I can see why it did not last in it's original configuration long with most divers. Also included in these pictures are the original riveted diaphragm, now quite crunchy, and the original green supply hose. The original US Divers marked corrugated hoses are still in great shape even after all these years. This regulator was a favorite of Poppy Lungmeister acording to Bryan of VDH!