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ONE OF MY COSTUMER HAS A PROBLEM WITH HIS UFH. AFTER 2-3 HOURS OF RUNNING UFH STARTS TO LEAK FROM BALANCING VALVES, EXACTLY FROM PLASTIC CAPS WHERE IS RATED L PER MIN. i TRIED TO PUT SOME LOCK TIGHT ON THE PLASTIC THREAD, IT DOSEN'T WORK, STILL IS LEAKING ALL OF THEM, JUST 3. i WILL BE HAPPY...