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Updated: May 20, 2025
This is similarly screwed to flange of pipe, and with leather packing. The valve is opened and closed by a movable rod. If fixed, it might catch the toes of the swimmer, and for this reason it would perhaps be best to set the valve itself back in a recess. Instead of this valve, an ordinary 4-in., 5-in., or 6-in. "plug" waste could be employed, but it is rather clumsy on such a scale.
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