Syringe holder for shell water detector test

The external SWD fiting was designed to allow the SWD test to be carried out without opening the sampler lid and so exposing the fuel sample to possible contamination. The external SWD is fitted to the inlet connection of the sampler and incorporates a piston valve. When the assembled syring/capsule is inserted into the external SWD fitting the action of doing so causes the front edge of the capsule to push open the piston valves, and allows fuel to flow to the capsule. The syring can be operated as normal to draw fuel through the capsule.