McVitie Weston valve collection, Raytheon valve, type 12A7
Raytheon valve, type 12A7, marked 17, (RMW/H28 - McVitie Weston number), by Raytheon Manufacturing Company.
Raytheon valve, type 12A7, marked 17, (RMW/H28 - McVitie Weston number), by Raytheon Manufacturing Company.