He has impressed at British & Irish Cup level and was the starting hooker in the 2010 B&I Cup Final. He was also a member of the squad that captured the B&I Cup title last season.
He earned his sixth cap for Munster during the 2013 opener earlier this month against Cardiff Blues.
Speaking on the recent signing, Connacht Rugby CEO Tom Sears said:
"We are delighted to have been able to bring Sean back to his home province and have no doubt he will bring real quality to our squad and increase the competition for a place at hooker. He was very highly regarded at Munster and it is great news that he sees his future with Connacht."
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