Topp Industries

A proven leader in sewage, sump and wastewater markets, TOPP offers high-quality environmentally responsible products, including fiberglass, polyethylene and structural foam basins, tanks, basin and tank covers, lift stations, septic tank risers, extensions and accessories.

Fiberglass Basins

TOPP fiberglass basins, covers and accessories are manufactured with the highest quality material and testing standards currently in the wastewater, water treatment, sewage and sump markets. Our chop-hoop filament wound tanks are available in 18”, 24”, 30”, 36”, 42”, 48”, 60”, 72”, 96″ and 120″.

Valve Boxes

TOPP’s FIberglass Valve Vault, for basin guide rail systems for pump stations, lift stations and other applications, is constructed of durable fiberglass. “Frog-mouth” or solid composite fiberglass or aluminum covers available. Also available with or without discharge piping and valves. Optional 18” extension available for applications requiring a discharge depth of 36” down to centerline.


TOPP offers a variety of covers suitable for various needs including H-20 Hatch/Access covers, aluminum catch covers, non-skin fiberglass covers and more.


TOPP offers a variety of accessories including:

  • Stainless steel float brackets
  • Lifting lugs, heavy duty
  • Aluminum ladder
  • Screened green vents
  • Threaded couplings
  • Inlet hub, multi-tite hub, composite hubs, cast iron caulking hubs, aluminum inlet hubs
  • Aluminum bolt-on sleeves
  • Link seals
  • Flexible boot fittings
  • Plastic and cast iron 2-bolt pipe flange
  • “Ringer” pipe grommets
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