McVitie Weston valve collection, valve, type 208J (Exptl)
Valve, type 208J (Exptl), cylindrical tube 2.75in diam, 14 in long, with side evacuating tube, two-ended with multiple flying leads at each end, marked - Tube soft, glass cracked, (RMW/Y402 - McVitie Weston number), by Unknown maker.