Vospers Fire Hose Nozzle
The guy selling it said it came from a boat but I feel it probably came from the Vospers works in Portsmouth as the markings look more ownership than branding. The barrel seems to be dated Sept 1940 and the 1/2" nozzle looks to be dated Aug 1942.
I should think this nozzle probably saw a lot of action with Portsmouth receiving 67 air raids between July 11th 1940 and the end of May 1944. 38,000 Incendiary bombs and 1320 high explosive bombs.(Smitten City, The story of Portsmouth under the Blitz)
I cant find many wartime images of Vospers yard but here it is in 1939 with some of their early MTB’s.