AS/NZS 4798(INT):2005 PDF
Specifies requirements for the design and manufacture of non-person man entry polyethylene maintenance shafts intended for buried sewerage systems at depths up to 6 m and diameters up to DN 300 comprising a moulded chamber and riser in one-piece seamless construction or a moulded base jointed to an extruded pipe shaft manufactured from a compatible material.More Standards PDF
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