Angle stop ball valve: Angle stop ball valves are preferred for residential and industrial water systems. Ball valves are quarter-transform valves, that means the take care of ought to be turned 90° to open or shut the valve absolutely. I tried to convert a single knob and it broke, fortunately. https://ear-treatment-chewy77766.snack-blog.com/30311166/getting-my-ball-valve-angle-stops-to-work