_:vb6868770	<http://purl.org/dc/terms/bibliographicCitation>	"2006, Richard M. Tanner, \u201CLockheed Tristar: Single-point Tanker\u201D, in History of Air-to-air Refuelling, Barnsley, South Yorkshire: Pen &#x26; Sword Aviation, Pen & Sword Books, \u2192ISBN, part 2 (Technology), page 286, column 1:"@en .
_:vb6868770	<http://www.w3.org/1999/02/22-rdf-syntax-ns#value>	"A standard Flight Refuelling Ltd Mk 8 probe nozzle was attached to the probe structural tube and fuel pipe. The pipe was double-walled, and passed through into the fuselage aft of the flight deck;  [\u2026]  A non-return valve was fitted within the fuel pipe aft of the probe nozzle, thus preventing any leakage of fuel if the aircraft lost the probe nozzle inadvertently."@en .