Two main problems: 1) There is no stop for the "off" position so you can never be sure if it's really "off". "is" or closed. Most ball valves have a 90 degree rotation, on/off. This one is 180 degrees, so the center is off. What happens is that you pump from start to finish and back, and when If you don't put it right in the middle, you have a leaky valve 2) Even if it's in the middle "off" or closed position, it's never fully closed The gasket on this valve is too loose. All of this makes it useless unless you really need the "off" position on your valve, which makes no sense.
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