The Snyder Industries 120 Gallon Sodium Hypochlorite (UV) Double Wall Tank is a contained, double-wall vessel built for storing heavier-than-water liquids where a secondary containment layer is part of the plan. It holds 120 gallons in a compact 34-inch by 34-inch footprint, standing 51 inches tall, so it fits tight equipment pads and indoor chemical rooms without sprawling. The tank is molded in Opaque White HDLPE (resin #880059) and carries a 1.9 specific gravity rating, meaning the wall is engineered for dense contents well beyond plain water. The Opaque White wall also helps you read fill level and inspect the tank on a UV-sensitive service like sodium hypochlorite, where keeping light off the stored liquid matters.
Does it fit your job?
Sizing this double wall tank is about weight, not just gallons. Filled with water, the system runs about 1,001 lb; at its full 1.9 specific-gravity rating the contents can reach 1,902 lb. Confirm your pad, floor, or skid can carry that fully loaded figure before you set it. If you are working through pad thickness or want to sanity-check your fill volume against usable capacity, run the numbers with our Tank Sizing Calculator and the Tank Sizing Guide. Because it is a double wall (containment) design, the freeboard and usable-volume behavior differ from a single-wall tank — our writeup on Snyder Captor double-wall freeboard sizing per ASTM D1998 walks through the real volume you can actually use.
Fittings and access
Per the technical drawing on this page, this tank comes with a 14-inch PE threaded, vented fill and a manway with 11-3/8-inch access for reaching inside to clean or inspect. Match your plumbing and venting to these two openings before install. On a sodium hypochlorite service the wetted seals are what fail first, so verify the thread and O-ring materials on the 14-inch vented fill and the gasket on the 11-3/8-inch manway against your stored liquid rather than assuming the tank body alone defines compatibility. For containment-driven installations, our guide on Snyder Captor double-wall tanks for SPCC 40 CFR 112 compliance covers where a double wall earns its keep, and the concrete pad sizing framework helps you get the foundation right.
The mistake to avoid
Do not undersize the foundation to the water weight. This tank is rated to 1.9 specific gravity for a reason, and the difference between the water figure and the full rated contents is nearly 900 lb. Design the pad and any tie-downs to the higher number.
This double wall tank ships LTL from the Snyder plant in Marked Tree, Arkansas, on a freight carrier, with cost quoted live to your ZIP code — get your number instantly with the Freight Cost Estimator or call us at 866-418-1777. Listed before freight; freight is quoted separately to your delivery ZIP.
