Gemini Dual Containment® Tanks are durable, heavy-duty and are unaffected by the ultra-violet rays of the sun or other environmental conditions, which makes them perfect for indoor or outdoor use. The Gemini “Tank-in-a-Tank” design provides you with a perfect solution for storage and dispensing of your chemicals into your processes, with standard features like the pump mounting platform, overflow dikes, vented lid and threaded fittings, which offer years of trouble-free and maintenance free service.