The Snyder Industries 120 Gallon ASTM XLPE Double Wall Tank (SKU 5700102N42) puts primary storage and secondary containment in one footprint. Molded in crosslinked linear polyethylene (XLPE) and rated to a 1.9 specific gravity, this double wall tank holds 120 gallons in a compact 34 by 34 inch footprint, stands 51 inches tall, and ships in natural white. The inner XLPE wall and the integral outer containment shell work together so a leak from the inner tank is caught by the outer wall instead of reaching your floor, drain, or soil.
Will it work for your site?
Full to capacity with water, the inner tank carries roughly 1,001 pounds of contents, and the structure is rated to a maximum contents weight of 1,902 pounds. That spread is the whole point of an XLPE double wall tank: the 1.9 SG rating means the wall is built for liquids denser than water, where a basic single wall water tank tops out near 1.0 SG. Plan a level pad at least 34 by 34 inches and rate it, plus any saddle or strap, for the full 1,902 pound loaded weight rather than the empty shell. Per the technical drawing on this page, the fitting package includes a 14 inch PE threaded and vented closure plus a manway with an 11-3/8 inch access opening, so you can fill, vent, and reach inside for inspection or cleaning. See the technical drawing on this page for fitting placement and the exact dimensional layout before you set the tank.
Fittings and connection compatibility
The two interfaces drive what hardware you order. The 14 inch closure is a coarse PE thread, not pipe thread, so it mates to a 14 inch PE-thread vented lid or fitting; do not order an NPT adapter expecting it to seat. The manway needs a gasket and lid sized to the 11-3/8 inch access opening to seal correctly. Because this is a double wall unit, the manway is also your route for interstitial and inner-wall inspection over the life of the tank, so plan to keep that access serviceable. Confirm your fill, vent, and gasket hardware against the 14 inch PE thread and 11-3/8 inch manway before delivery.
Double wall sizing and inspection
Double wall and crosslinked tanks size differently than a single wall water tank, because freeboard and density both reduce the volume you can actually put to work. If you are matching this 120 gallon double wall tank to a real duty cycle, run your numbers through the Tank Sizing Calculator and read the Tank Sizing Guide first. For the engineering behind crosslinked double wall freeboard, our breakdown of Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through thermal expansion, chemistry, and density. Operators tracking wall integrity should also read our note on wall thickness at the vapor-saturated headspace, where premature failures tend to start, and our guide on interstitial-space inspection for double wall tanks.
The mistake to avoid
The most common error with a tank like this is treating the 1.9 SG rating as gallon headroom. The rating tells you the maximum liquid density the wall is built for; it does not raise the 120 gallon capacity. Size the pad, anchors, and strapping for the full 1,902 pound rated load, confirm the 14 inch PE thread and 11-3/8 inch manway access match your hardware before the tank arrives, and keep this XLPE double wall unit on duty for liquids heavier than water rather than swapping in a lighter single wall tank.
This Snyder XLPE double wall tank ships LTL freight from the Marked Tree, Arkansas plant, quoted live to your ZIP. Get your number with the Freight Cost Estimator, or call 866-418-1777 and our team will quote the freight and confirm fittings before the truck rolls.
