well I picked up a used water cooling kit, and the previous owner cut off the tubing at the rad and water block as shown here:
both the block and the rad have the same type of fittings. HOW do I get them off? I dont want to use brute force and break anything, but am I missing a technique to do this easily? thanks a lot in advance!!

both the block and the rad have the same type of fittings. HOW do I get them off? I dont want to use brute force and break anything, but am I missing a technique to do this easily? thanks a lot in advance!!