McVitie Weston valve collection, Mueller Media X-Ray tube valve
Mueller Media X-Ray tube valve, marked 267 305, cathode clamp marked 971, 3.5in glass tube with end tubes 1ft 8in long overall, E.S. filament cap at one end, anode and water connector at other end, (RMW/K65A - McVitie Weston number), by Unknown maker.