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 in waste holding tanks but also in restroom trailers. It provides an oxygen-rich environment to promote aerobic waste breakdown and exhaust odors and gasses into the open air. It works in any wind condition, stationary or mobile, and the design will not allow a downdraft to occur in the vent pipe. The siphon has no moving parts, requires no maintenance and operates effectively at any angle. 503/559-8094; www.360productsinc.com.