Strong, impact-resistant polyethylene holding tanks from Satellite Industries have two internal pillars and thickened corners, and are designed to stack high, resist cracking and decrease wear-through from sliding and dragging. Fittings are molded, not spin-welded, for greater strength and all ports and connectors are recessed to guard against breakage. The 300-gallon-capacity polyethylene tanks can be connected end to end with standard rubber fittings to increase waste storage when needed. They are available in gray or a natural translucent color. Optional 5- and 10-inch manways are available. 800/328-3332; www.satelliteindustries.com.