Unless you have (or buy/borrow) a PEX crimping tool, chances are you can't successfully tighten those crimped bands. Probably easier and less costly would be to purchase a couple of Sharkbite elbows, cut out the leaking elbows and replace them with the Sharkbite connectors.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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