Both teams will arrive at Sunday's match on the back of wins against the Ospreys; the Scarlets beating the Ospreys at Llandarcy 17-11 three weeks ago and RGC 1404 beating the Ospreys 40-13 on Sunday.
The Scarlets team selection includes a number of changes including first starts for Steff Phillips, Ceiron Evans, Lee Taylor and Jevon Barnes.
Scarlets team v RGC1404:
15 Dai Treharne, 14 Jevon Barnes, 13 Steff Evans, 12 Morgan Griffiths, 11 Josh Adams, 10 Daniel Jones, 9 Kieron Hardy, 1 Steff Phillips, 2 Ryan Elias, 3 Ceiron Evans, 4 Josh Helps, 5 Alex Washbourne, 6 Lee Taylor, 7 Will Boyd (c), 8 Tom Phillips
Replacements: 16 Dafydd Hughes, 17 Jack Parry, 18 Javan Sebastian, 19 Jake Baker, 20 Josh Middleton, 21 Gareth Rees, 22 Jack Maynard, 23 Craig Woodall