I’m dealing with a leaking hose bib from a defunct manufacturer. After opening it up, I found a failed gasket and tried punching a custom replacement, but it still has a slow leak under pressure.

According to a local plumbing supply shops, these units use a 1" fine thread (not sure on exact measurement) setup, and the company is no longer in business. Because the bib is set tight against my stucco, I really want to avoid a full replacement.

Does anyone know of an adapter that converts this fine thread to a standard 3/4" MHT? My goal is to simply screw on an off-the-shelf vacuum breaker to the adapter.