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Hi Folks, Can anyone tell me the difference between a Bi-directional valve and a reversible flow valve. :? A seriously confused plastic plumber :?

Hi Folks, Can anyone tell me what the difference is between a bidirectional and a reversible flow rad valve is please. :? :?

Hi, I have a problem with the front window wipers. When the wipers are on the intermittent setting they keep sticking and juddering down the screen, but they are ok when on the constant setting.