The 360 Siphon Roof Vent goes to the source to prevent holding tank odors and toxic gases from entering the RV living space. Works in any wind condition, stationary or mobile. It replaces your regular roof vent cap and is easily installed with a screwdriver and putty knife. There are no moving parts to wear out or require maintenance. UV resistant--constructed of highly durable polycarbonate compounds. Made in North America.