Large Size, strong plastic construction 5.125 inch (130mm) dia. Metal gas valve. Silicon rubber gasket, which does not need lubrication to work. The ends have strong nylon rope with handles for pulling. The two halves are also connected by a piece of rope, so that they do not fall down accidentally.
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Physics Liquids And Air Pressure - 346-15 - Magdeburg Hemispheres Plastic
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