The Snyder Industries 6600 Gallon ASTM Black Vertical Storage Tank (SKU 5300400N49) is a large-format bulk water tank molded from polyethylene, standing 158 inches tall on a 120 x 120-inch square footprint. It is built to the heavy-duty 1.5 specific-gravity wall rating, meaning the shell is engineered to hold contents up to 1.5 times the density of water. For plain water service that is real structural margin, not just a number: filled to 6,600 gallons of water the tank carries roughly 55,044 pounds, while the wall is rated to 82,566 pounds of contents at its full 1.5 SG. If the service ever shifts to a denser fluid later, the same shell already carries that margin. For a fire-water reservoir, a bulk or process-water buffer, or an irrigation cistern, that headroom is what keeps the wall inside its design stress at full fill.
Will it work for your site
This is a vertical storage tank, so plan the pad for a 120 x 120-inch square base and confirm your overhead clearance clears the 158-inch height plus the fitting stack. Read the fittings by function rather than as a list: the flange is your bolted connection point for plumbing the outlet or fill line, the 18-inch PE threaded and vented fitting gives you threaded access that also vents the tank, and the manway with 15-inch access is for interior inspection and cleaning. The venting matters on a tank this size — a sealed tank can pull a vacuum and buckle under fast draw, or over-pressure on a fast fill, so keep that vent path clear. See the technical drawing on this page for the exact fitting layout. Before you set it, run your numbers through our Tank Sizing Calculator and the Tank Sizing Guide so your working volume, not just the nominal 6,600 gallons, matches your draw and refill cycle.
Plumbing the outlet and the pad beneath it
At 158 inches tall, a full tank puts roughly 13 feet of static head on the bottom outlet, so spec the flange connection, valve, and outlet piping for that pressure, and make up the bolted flange with a gasket rated for the stored fluid so the joint stays leak-free at full head. Under the tank, more than 27 tons of water at full fill demands a level, continuously supported base — a proper pad is not optional at this size. Our guide on concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework so the slab carries the load evenly and the tank floor stays fully bedded. For rural fire-protection reservoirs, our fire-water reservoir design guide covers NFPA 22 sizing discipline and cold-climate freeze protection.
One thing not to skip
The 1.5 SG rating governs what this tank can hold, not just how much. It is the top wall rating on this model and it is built for water and comparable-density contents. If your plan is anything heavier than water, verify the fluid's density against the 1.5 rating before you fill, since exceeding the specific gravity the wall was designed for is the most common way a large vertical tank gets overloaded.
This Snyder vertical black storage tank ships LTL from the Snyder plant in Chowchilla, California, quoted live to your ZIP. A 6,600-gallon, 158-inch tank is an oversized freight move originating on the West Coast, so East and Midwest destinations should plan for long-haul oversize LTL — get a real number before you commit with our Freight Cost Estimator, or call 866-418-1777 and we will quote delivery and offload options for a tank this size.
