CREATE TABLE table_13548 ("Team" TEXT, "Outgoing manager" TEXT, "Manner of departure" TEXT, "Date of vacancy" TEXT, "Replaced by" TEXT, "Date of appointment" TEXT, "Position in table" TEXT)

who is the replacement when the team is port vale?
SELECT "Replaced by" FROM table_13548 WHERE "Team" = 'port vale'
SELECT "Replaced by" FROM "table_13548" WHERE "Team" = 'port vale'