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POLYPIPE BUILDING PRODUCTS AJ ENQUIRY NO: 201 Polypipe Building Products of Doncaster has launched a new 450mm-diameter manhole cover and frame. Manufactured in polypropylene, this extremely strong and robust yet lightweight cover complies with Approved Document H of the Building Regulations, which stipulates that inspection chambers should have removable non-ventilating covers. Polypipe's manhole cover can also be secured with three screws to deter unauthorised access and is suitable ...

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