The Althon H3G Headwall is a one-piece glass reinforced cement (GRC) headwall with an opening to suit 150mm diameter pipes and knockout webs to enlarge to 225mm and 300mm diameter pipes. Stainless steel sockets are provided for the attachment of gratings. The dimensions of the unit are as the H3C (linked below) with a reduced toe depth of 150mm and nominal wall thickness of 20mm.
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