Hi All
I've been defeated by shut off valves seeming to go sticky and then the plastic screw on valve handle snapping in the centre where the screw fixes it. But I've just found the reason... well in my case at least. The plastic hose (cold inlet pipe) with its plastic hand screw tight threaded (female) connector fouls the full path of the valve's plastic handle... but only when fully turned on. So it doesn't notice when installing the inlet hose.
This is what makes the valve seem like its failing. The clearance is so tight that the hose's screw on connector screws down too far causing this problem. I wonder if the use of an additional washer inside the inlet valve would help?
Anyone else noticed this happening? Rgds., Tom