McVitie Weston valve collection, Brimar valve, type 25U4GT
Brimar valve, type 25U4GT, (RMW/Y311 - McVitie Weston number), by Standard Telephones and Cables Limited.
Brimar valve, type 25U4GT, (RMW/Y311 - McVitie Weston number), by Standard Telephones and Cables Limited.