Expansion clean-out plugs from Real-Tite Plugs are reusable due to their neoprene gasket composition that retains its memory over time. They eliminate the need for an extra fitting or adapter. Plugs come packaged in used plastic wrap from furniture companies and boxes are relabeled and put back into use. Plugs are available in sizes ranging from 1.5 to 4 inches. 952-938-0600; www.real-titeplugs.com.