Ulster's only defeat in their last eight Magners League games was 26-34 at Leinster on 16 April, whilst the Ulstermen's solo defeat to a Welsh region this season was 22-23 at Ospreys in round 14.
Ulster won 25-23 against Dragons at Ravenhill on 18 March and have only once before achieved a league double over the Welshmen - in season 2005/06.
Referee: Alain Rolland (47th League game).
Assistant Referees: Tim Hayes, Gwyn Morris (both WRU).
TMO: TBC
Live on S4/C and via red button on BBC Sport NI.
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