The Snyder Industries 80 Gallon ASTM HDPE Black Square Double Wall Tank is a containment-grade vessel built for sites where a spill cannot be allowed to reach the ground. It holds 80 gallons in a compact 24 x 24 inch square footprint, stands 43 inches tall, and uses an integral double-wall design: a primary tank nested inside a secondary tank, so a leak in the inner wall is caught by the outer shell rather than by your floor or soil. The body is molded from high density linear polyethylene in black, rated to a specific gravity of 1.9. Quick spec read: 43 in H x 24 in W x 24 in L, 80 gal, black HDPE, SG 1.9 rated.
Will it work for your application
The 1.9 specific gravity rating is the number that matters most here. Specific gravity is the weight of your liquid compared to water, and 1.9 means this square double wall tank is engineered to safely hold liquids nearly twice as heavy as water at full volume. Water itself has an SG of 1.0, so for plain water service you have substantial margin. Plan your weight load around the contents, not just the gallons: 80 gallons of water weighs 667 pounds, and the tank is rated to carry contents up to 1,268 pounds, which is what the 1.9 SG rating buys you. Confirm your liquid's specific gravity is at or below that 1.9 ceiling before you fill. The square 24 x 24 footprint makes this an efficient choice where round tanks waste floor space, such as against a wall or inside its own secondary containment. Review the technical drawing on this page for the exact dimensional layout, and use our Tank Sizing Calculator or Tank Sizing Guide to match capacity to your draw-down needs rather than to nameplate gallons.
Fittings and configuration
Fitting and outlet configuration is shown on the technical drawing on this page. Before you order, contact us at 866-418-1777 to confirm bulkhead, vent, and fill-port sizing against your plumbing so the connections match on the first install rather than after the tank arrives.
The mistake to avoid
The double-wall construction is the whole point of this tank, so do not treat it like a single-wall vessel. The interstitial space between the inner and outer walls exists to contain a primary failure, and the most overlooked failure mode on double-wall HDPE is not the liquid-side wall at all but the vapor-saturated headspace above the fill line, where premature wall degradation often originates and where liquid-side inspection misses it. Our guide on HDPE tank wall thickness at the vapor-saturated headspace explains why, and our breakdown of Snyder Captor double-wall freeboard sizing per ASTM D1998 covers how to leave proper freeboard so thermal expansion does not push liquid into the interstitial monitoring space. The second mistake is sizing to nameplate gallons without accounting for that freeboard: the real usable volume is under 80 gallons once you size correctly, so size to your actual draw-down with the Tank Sizing Calculator.
Freight and ordering
This black square double wall HDPE tank ships LTL freight from our Marked Tree, AR fulfillment point (confirm origin at quote), with the cost quoted live to your ZIP code. Because it is a heavier double-wall vessel, freight is best confirmed before you commit. Get an exact rate from our Freight Cost Estimator, or call us at 866-418-1777 and we will line up the quote and answer any spec questions. If your install supports a fire-water or emergency reserve role, our fire-water reservoir tank design guide covers NFPA 22 sizing and cold-climate freeze protection for polyethylene tanks.
