Scarlets took the lead again with a 37th minute Priestland penalty but Munster once again struckbackquickly, Warwick converting a penalty for an incident that saw Deacon Manu yellow carded and then backs and forwards combined in injury time for a move that ended with the impressive James Coughlan crashing over.
Half-time: Munster 17-8 Scarlets.
Priestland and Warwick exchanged early second half penalties and with the exchanges fierce throughout Priestland edged the penalty battle in the latter stages, 2-1 but Munster held their nerve in a close end game for a victory that takes them to third place in the table.
Munster: S Deasy; D Howlett (D Hurley 54 min), T Gleeson, J de Villiers, I Dowling; P Warwick, P Stringer (D Williams 65 min) (J Manning); M Horan, D Varley (D Fogarty 60 min), J Brugnaut (D Ryan 60 min); M O'Driscoll capt, B Holland; N Williams (A Quinlan 65 min), N Ronan (T O'Donnell 73 min), J Coughlan.
Scarlets: D Newton; J Ajuwa, R King, J Davies, A Fenby; R Priestland, T Knoyle; I Thomas, K Owens, D Manu; L Reed, D Day; J Turnbull, R Pugh, D Lyons capt. Replacements: P John, E Phillips, D Welch, R McCusker, M Roberts, D Evans, G Maule.