McVitie Weston valve collection, NAPL valve, type VU39/4
NAPL valve, type VU39/4, marked NAPL 101 10E/9600, (RMW/Y554A - McVitie Weston number), by Unknown maker.
NAPL valve, type VU39/4, marked NAPL 101 10E/9600, (RMW/Y554A - McVitie Weston number), by Unknown maker.