THE EE WAS REMOVING A 3"" NIPPLE FROM A SUMP PUMP WITH A PIPE WRENCH. HE HIT THE WRENCH WITH A HAMMER, CAUSING THE WRENCH TO SLIP AND PINCH HIS FINGER. THE EE COMPLETED HIS SHIFT, AND SOUGHT ME DICAL EVALUATION THE FOLLOWING MORNING. HIS LEFT RING FINGER WAS X RAYED AND FOUND TO BE FRACTURED. THE FINGER WAS SPLINTED AND THE EE WAS RELEASED TO MODIFIED DUTY WITH INSTRUCTIONS TO MAINT