You have a double shutoff there. The tubing to the right is for the dishwasher. You may want to pick up a compression double stop with two handles. That way you don't shut off both the dishwasher and the kitchen sink while when is being repaired.
I don't know why you would sharkbite something so simple. You just slide on a new shutoff and snug it up with a cresent wrench.
Are we forgetting how to use tools?