Holding tanks from PolyJohn are durable, sanitary receptacles used for collecting waste in portable restrooms. They may be used for long-term portable sites where indoor plumbing is not an option. Made from highly durable plastic, the holding tank design is functional and discreet. It’s also compatible with other PolyJohn restrooms and sinks and can be easily configured with most any type of plumbing. For outdoor work sites or special events, use the holding tank to complete any portable restroom area. They are available in 250- and 300-gallon capacities. 800-292-1305; www.polyjohn.com.