The Enduraplas 550 Gallon Green Vertical Storage Tank is a 550-gallon polyethylene vertical built for bulk water and liquid storage where overhead clearance is tight. It stands 52 inches tall on a 60 x 60 inch base, so it sits low and stable under awnings, low ceilings, and pump-house roofs rather than reaching up like a tall slim vertical. The trade-off is honest: this is a squat, wide tank, so it carries a low center of gravity but takes up more pad area (a full 60 x 60 inch footprint) than a narrow vertical of equal volume. It is molded in green polyethylene for outdoor non-potable water service, and the 1.9 specific gravity rating tells you exactly how much weight the tank wall is engineered to carry.
Will this Enduraplas vertical work for your job?
Filled with water, this tank holds roughly 4,587 pounds of contents, and the wall is rated to carry contents up to 8,715 pounds at the 1.9 specific gravity rating. That spread matters: water is the light end of what this tank can hold, so you have real structural headroom for water storage and plenty of margin for heavier liquids within the rating. Before you lock in a size, run your numbers through the Tank Sizing Calculator and the Tank Sizing Guide so the 550-gallon capacity and 60 x 60 inch footprint line up with your draw rate, refill cycle, and available pad space. Check the technical drawing on this page for the molded-in dimensions before you set the pad.
What the 1.9 specific gravity rating is telling you
The 1.9 specific gravity rating is the single most important number to respect on this vertical storage tank. It means the wall is engineered for liquids up to 1.9 times the weight of water, and the matching ceiling is 8,715 pounds of contents. Here is the decision rule: take your liquid's specific gravity, confirm it stays at or below 1.9, then confirm your fill weight stays under 8,715 pounds. For straight water you are well inside both limits. The mistake to avoid is treating the gallon number as the only constraint and filling the tank with a liquid heavier than its rating allows.
Siting, pad, and water-reuse setups
A loaded vertical of this size needs a flat, fully supporting base under the entire 60 x 60 inch footprint. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework so the slab carries the full contents weight evenly. If this tank feeds a rural or remote fire-water reserve, our write-up on fire-water reservoir tank design covers NFPA 22 sizing discipline and freeze protection for cold-climate service. For grey-water, rainwater, and condensate reuse, see our breakdown of industrial water reuse tank topology, and for rooftop capture our guide on first-flush diverter sizing.
This Enduraplas 550-gallon vertical storage tank ships LTL freight, quoted live to your ZIP from whichever of our two plants is closer: Converse, TX for the South and Southwest, or Neche, ND for the Upper Midwest and Northern Plains. Nearest plant means a shorter LTL lane and lower freight. Get an exact number through the Freight Cost Estimator, or call 866-418-1777 and we will quote it for you and confirm the right tank for your site.
