Flexible non-metal corrugated pipes for drainage and sewage purposes, but not for irrigation purposes, and fittings couplings therefor

Non-metal storm water treatment units comprised of[ chambers,] pipes and fittings and couplings therefor, [risers, baffles, baffle plates, and weir plates;] rigid non-metal corrugated pipes and conduits for drainage and sewage purposes, but not for irrigation purposes, and fittings and couplings therefor