The kit includes: The 3 way valve, all fittings required for standard 8mm and 10mm (outside diameter, for extra flow with veg oil) nylon pipe connections , 1 elbow, basic diesel filter, jubilee clips,high quality electrical switch, electrical cable, a length of 8mm and 10mm nylon pipe, etc. etc.
The second fuel tank is not supplied as this can be easily obtained from a marine chandler.
More information at: http://www.vegetableoildiesel.co.uk/conversionkits.html
There is a choice between having a basic single valve kit or having an extra valve, with appropriate fittings, to give a double valve system: