Two tries in four minutes earned St Helens a Challenge Cup, minor Premiership and Grand Final treble but only after brave resistance from Hull.
Sean Long's kick set up Francis Meli's opener before Sid Domic finished off a slick move to level for Hull.
Leon Pryce's score put daylight between the teams at half-time before Willie Talau and Ade Gardner turned the screw.
By the time Keiron Cunningham scored his 150th try for Saints, the outcome was already a formality.
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