The 360 Siphon from 360 Products can be used when a one-way airflow updraft is needed to eliminate high-pressure conditions in enclosed spaces, primarily waste-holding tanks. It channels wind movement to provide an oxygen-rich environment that promotes aerobic waste breakdown and exhausts odors and gases into the open air. It has no moving parts to wear out, requires no maintenance and is designed to operate effectively at any angle. It can be used as a holding tank odor-control vent in residential and commercial applications, and is available in open stack mount or flanged models. 503/559-8094; www.360productsinc.com.