Tube of a fire engine with valve from the wreck of the Dutch East India ship  Hollandia
Fire engine, firehose, valve; fragm: straight tube, on one end valve seating, circular with semicircular orifice and semicircular boss forming hinge pivot, and (flap)valve, consisting of a semicircular disc with 2 pierced arms fitting onto either side of hinge boss: (flap)valves, id. with hinge bosses in situ.