Low-Profile septic tanks from Norwesco have molded-in support columns that are filled with flowable soil before backfilling to maximize strength, stabilize the tank during backfill and reduce buoyancy. The tanks have molded-in tie down and lifting lugs on the corners for ease of handling and moving. The inlet and outlet holes are predrilled. Gaskets and field-adjustable sanitary T’s that can accept SDR 35 or schedule 40 pipe are included with the tank. The tanks are one piece so they do not have to be assembled by certified personnel. Dual-wall pipe or PVC ribbed pipe can be used for a riser. 800/328-3420; www.norwesco.com.