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Ebbsfleet will play in the 125th Kent Senior Cup final at Priestfield after seeing off Whitstable at Stonebridge Road on Tuesday night.
The semi-final was switched from The Belmont in order to beat the weather and the nominal visitors scored a goal in each half to get the job done.
Fleet boss Steve Brown made seven changes to the side which beat Staines in Skrill South on Saturday. New signing Yado Mambo played his first game for seven months, alongside the returning Paul Lorraine in central defence, as he continued his recovery from a knee operation.
Whitstable, struggling towards the bottom of Ryman League Division 1 South, struggled to get out of their half during the first 45 minutes.
Anthony Cook had a shot palmed away by Oystermen keeper Dale Watkins before firing a second attempt against the bar.
But after Lorraine had seen a header from a corner cleared off the line, Scott Heard tested Fleet keeper Brandon Hall with a shot at the other end.
However, that sparked Ebbsfleet back into life and after Cook had combined with Chris Sessegnon, Ben May swivelled and fired a low shot beyond Watkins.
The second half was a muted affair although Mark Murison, Joe Kane and Ashley Baverstock all went close to forcing extra-time.
But the Fleet secured their place in the final on May 5 when substitute Billy Bricknell hammered home his 15th goal of the season.