
McVitie Weston valve collection, Ediswan bimetallic thermal switch valve

Ediswan bimetallic thermal switch valve, two ended glass envelope with black moulded cap at each end, (RMW/K1 - McVitie Weston number), by Royal Ediswan.
Ediswan bimetallic thermal switch valve, two ended glass envelope with black moulded cap at each end, (RMW/K1 - McVitie Weston number), by Royal Ediswan.