The Enduraplas 865-gallon vertical rainwater harvesting tank (SKU 45537) is a black polyethylene storage tank built to capture and hold collected rainwater for irrigation, livestock, and non-potable household supply. It stands 75 inches tall on a 61 x 61 inch round footprint, so it fits a compact pad while holding real volume. Black pigment is the practical choice for harvested-water storage: it blocks light and suppresses the algae growth that clear or translucent tanks invite. If you are still working out how much capacity your roof catchment and demand actually call for, run the numbers through our Tank Sizing Calculator and the Tank Sizing Guide before you commit to a footprint.
Will this tank work for your site?
Filled to capacity, this tank carries roughly 7,214 pounds of water over that 61 x 61 inch footprint. That figure is water only, at a specific gravity of 1.0 — the load scales directly with the weight of whatever you store, which is exactly why the pad underneath matters. A tank this size wants continuous, uniform support, not soil that will settle unevenly. Our guide to concrete pad sizing for above-ground polyethylene tanks walks through the ACI 360R-10 framework for getting that foundation right.
The outlet and how you connect to it
The technical drawing on this page shows a bulkhead-style outlet fitting sized at 1" NPT. A bulkhead is a through-wall fitting: it penetrates the tank wall and seals against it with a gasket, so your draw line lands on the tank body itself. The thread size governs what mates to it — any valve, hose barb, or camlock you add should be 1" NPT to thread in directly without an adapter. That single outlet is what the sheet confirms; if your rainwater setup needs a separate inlet, vent, or overflow fitting, those are add-ons we quote by phone rather than items shown on this drawing.
Sizing it into a rainwater system
An 865-gallon vertical tank sits in the middle of the rainwater-harvesting range — large enough to ride through dry stretches, small enough to place near a downspout run. Pair it with proper pre-tank filtration: our write-up on first-flush diverter sizing per the Texas Manual on Rainwater Harvesting covers keeping roof debris out of stored water, and rainwater harvesting tank sizing by state ties capacity to your local rainfall and rules. If this tank is part of a rural fire-water reserve, the NFPA 22 reservoir design guide covers sizing discipline and cold-climate freeze protection.
The mistake to avoid
This is a rainwater and non-potable water storage tank. Do not press it into chemical service — the drawing and spec set here confirm capacity, dimensions, and a 1" NPT bulkhead, but no specific-gravity service rating is published for this unit. If your liquid is heavier than water (specific gravity above 1.0), you need a tank with a stated SG rating, not this one. Call us at 866-418-1777 before ordering and we will point you to an SG-rated equivalent that matches your liquid.
This tank ships LTL freight, and freight is quoted separately to your ZIP — it is not included in the listed price. Get a live number through our Freight Cost Estimator or call 866-418-1777 and we will size the tank, the fittings, and the delivery to your site.
