Wings Steven Davies and Luke Marsh, captain Ian Jones (2) and outside half Craig Evans scored the tries for the Scarlets with Evans adding four conversions.
The Ospreys defeated the Dragons 30-14 at Aberavon to secure their safe passage through to next month’s final at the Millennium Stadium. On the mark with tries for the Ospreys were David Watts, Aaron Bramwell, Ashley James and James Pike whilst James Dixon kicked two penalties and four conversions.