The Norwesco 750 Gallon Plastic Water Storage Tank (SKU N-41497) is a vertical polyethylene water storage tank standing 107 inches tall on a 46-inch diameter footprint, built for bulk water storage where vertical height matters more than floor space. It carries a 1.0 specific-gravity rating, which is the correct and intended rating for water service and the limit you should respect on what goes inside it.
Will this tank work for your job
At 750 gallons, a full tank of water weighs 6,255 pounds, and that figure is also the maximum rated contents weight for this tank. That load concentrates on the small 46-inch circle (about 1,662 square inches), so the static bearing pressure under a full tank is roughly 3.8 psi — hand that number to whoever pours your slab. The narrow 46-inch diameter makes this vertical tank a strong fit for tight equipment rooms, well houses, and along-the-wall installs where a wider tank will not go. If you are choosing between this and a shorter, wider model, run your volume through the Tank Sizing Calculator or read the Tank Sizing Guide to confirm the footprint and fill height work in your space.
Fittings and access
This vertical storage tank comes configured with two standard bulkhead fittings: the larger 2" bulkhead serves as your outlet or drain, and the 1-1/2" bulkhead serves as the supply or fill line. Each bulkhead seals with its own gasket, and the seal depends on clean, flat gasket seating — set the gasket square and snug it down without over-torquing, and the penetration stays watertight. Up top, a 16" vented manway gives you fill access and inspection; that vent lets air move in and out as the water level changes, so the tank breathes instead of pulling a vacuum on draw-down or pressurizing on fill. Keep the lid gasket and vent intact for that breathing to work. The 16" opening also sets the clearance for anything you put inside — a cleaning tool, a float switch, or a level sensor all have to pass through that manway, so size internal hardware against it. Confirm fitting heights and orientation against the technical drawing on this page before you cut and run your lines.
Sizing the foundation and the install
Get the slab right for that ~3.8 psi bearing load: see Concrete Pad Sizing for Above-Ground Polyethylene Tanks for the ACI framework. Remember that a 107-inch-tall, 46-inch-diameter tank is top-heavy when empty — anchor and strap it against wind, then bring it to partial fill promptly so it is not left standing tall and unballasted. After install, fill-test before you trust it in service; the Hydrostatic Test Methodology guide walks through water-fill discipline, pad-settlement monitoring, and fitting leak detection. For fire-reserve or reuse work, the Fire-Water Reservoir Tank Design guide and the Industrial Water Reuse Tank Topology guide cover sizing and storage-train design for those use cases.
The mistake to avoid
This tank is rated to 1.0 specific gravity — it is built for water. Do not assume a water-rated tank will safely hold a heavier liquid; anything denser than water exceeds the 1.0 rating and overloads the wall and floor. If your stored liquid is heavier than water, step up to a higher-SG-rated Norwesco vertical tank of comparable capacity rather than forcing it into this one — call us and we will point you to the right rating. Keep this Norwesco on water and it will serve you well.
This 750 gallon vertical tank ships LTL from the Norwesco plant in Burnet, TX, with freight quoted live to your ZIP. Get your exact number through the Freight Cost Estimator or call us at 866-418-1777, and we will help you confirm fit, fittings, and delivery for your site.
3 Year Warranty
