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NP-2 Reinforced Concrete, Light Duty, Non-Pressure Pipes For Drainage and Irrigation use, for Cross Drains/Culverts carrying Light Traffic.
NP-3 Reinforced Concrete, Medium Duty, Non-Pressure Pipes For Drainage and Irrigation use, for Cross Drains/Culverts carrying Medium Traffic.
NP-4 Reinforced Concrete, Heavy Duty, Non-Pressure PipesFor Drainage and Irrigation use, for Cross Drains/Culverts carrying Heavy Traffic.
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