I have an in-slab radiant system for a new house installed for 2000 SF of basement.  When I was away the electricity went off & the system froze.  The PEX tubing cracked (it is visibly split) & burst the concrete in about 10 spots.  It appears the concrete will need to be chiseled out & the PEX cut & have about a 6" connection made to replace the cracked pieces.  What are the best connectors for this repair & what else should be checked.