 Promotion and relegation in Leinster or Munster championships

If a non-Munster team wins the Joe McDonagh Cup, the bottom team in the Leinster championship is relegated to next year's Joe McDonagh Cup and is replaced in next year's Leinster championship by the Joe McDonagh Cup winners.This arrangement allows teams from Connacht and Ulster to gain promotion to the tier 1 championship.If a Munster team wins the Joe McDonagh Cup, they playoff against the team that finished bottom in the Munster championship for the right to play in next year's Munster championship, thereby ensuring that only Munster teams compete in the Munster hurling championship.