The Snyder Industries 120 Gallon Double Wall Tank (SKU 5700102N51) is a black, high-density linear polyethylene double wall tank rated to a 1.9 specific gravity, built for storing dense liquids where a secondary containment wall is required. It stands 51 inches tall on a compact 34 x 34 inch footprint, so it holds real volume without spreading across your pad. If you are weighing size against contents, this is the double wall HDPE tank to look at.
Will it work for your application?
Start with the two numbers that decide fit: dimensions and weight. The tank measures 51 in H x 34 in W x 34 in L, so confirm door, pad, and overhead clearance against that 34 x 34 footprint before you order. On weight, the 1.9 specific gravity rating is what matters. Filled with water (SG 1.0), this tank carries roughly 1,001 pounds of contents; at its maximum rated density it is engineered to hold up to 1,902 pounds. That headroom is why a double-wall Snyder tank suits heavier-than-water fluids, not just fresh water. Run your volume and weight through the Tank Sizing Calculator and the Tank Sizing Guide before you commit.
Fittings and what you can connect to
Per the technical drawing on this page, this tank comes with a 14" polyethylene threaded, vented fitting and a manway with an 11-3/8" access opening. Plan your plumbing around those two points: the 14" vented threaded fitting is your fill and vent port, and the 11-3/8" manway access sets the limit on the tools and hardware you can pass through for interior work and inspection. Both are sealed joints, so before the tank goes into service confirm the manway gasket condition and torque, and thread the vented fitting to spec. On an otherwise sealed double wall, those are your two leak paths.
The double-wall detail that trips people up
A double wall tank is a tank-within-a-tank: the interstitial space between the inner and outer walls is your leak-detection and containment margin, not usable headspace, and you should never drill through the outer wall for fittings. One honest note for water-only buyers: a black 1.9-SG double-wall is over-built for plain water, so if you do not have a secondary containment requirement, verify this is the SKU you actually need before paying for the double wall. Freeboard and thermal expansion also matter with dense contents. Our guide on Snyder Captor double-wall freeboard sizing per ASTM D1998 covers the real volume you can use, and the companion piece on HDPE wall thickness at the vapor-saturated headspace explains where premature failures actually start.
This tank ships LTL from the Snyder plant in Marked Tree, Arkansas, and freight is quoted live to your ZIP rather than folded into the list price. Enter your ZIP in the Freight Cost Estimator for a quote, or call us at 866-418-1777 and we will size the tank, confirm the fittings, and book the freight with you so the right double wall black tank leaves Arkansas and lands on your site the first time.
