out Blackpool's first kick by Robert Harris. Although King, Reece Brown, Luke Giverin and Brady scored, Scott Wootton's miss meant sudden death.
Ekangamene displayed great composure to chip his spot-kick over Halstead and substitute Menagh showed courage to face Lindegaard from 12 yards but the Dane's save means United progress to the final against Accrington Stanley, with the pre-season date to still be confirmed.
United: Lindegaard; Vermijl, Wootton, Brown, Giverin; Rudge (Gorre 89), Fornasier, Hendrie, Ekangamene, Brady; King. Subs: Wilkinson, Johnstone, Fletcher.