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A round manhole cover of a given diameter has a smaller surface area than a square cover of the same width, thus less material is needed to cast the manhole cover, meaning lower cost. The bearing surfaces of manhole frames and covers are machined to assure flatness and prevent them from becoming dislodged by traffic.
A drain cover is a cover with holes (e.g. a manhole) or a grating used to cover a drain, to prevent unwanted entry of foreign objects, or injury to people or animals. It allows drainage of liquids but prevents entry from large solid objects, and thus acts as a coarse filter. A sink drain cover is a drain cover used to cover the sink drain.
PVC/CPVC – rigid plastic pipes similar to PVC drain pipes but with thicker walls to deal with municipal water pressure, introduced around 1970. PVC stands for polyvinyl chloride, and it has become a common replacement for metal piping. PVC should be used only for cold water, or for venting. CPVC can be used for hot and cold potable water supply.
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A Waffenamt-Prüfwesen 1 report estimated [84] that with the M4 angled 30 degrees sideways and APCBC round, the Tiger I's 8.8 cm KwK 36 L/56 gun would be capable of penetrating the differential case of an American M4 Sherman from 2,100 m (6,900 ft) and the turret front from 1,800 m (5,900 ft), but the Tiger's 88 mm gun would not penetrate the ...