Doug Swarts, the inventor of the Drainmaster electric sewer valve, explains how the system permits an RVer to dump his or her holding tanks remotely from inside the RV. More information is available at http://Drainmaster.com or by contacting Doug at doug@drainmaster.com or (877) 787-8833.
The electronic valve demonstrated is the Drain Master S2VT Pro-Series Valve.
Related videos:
RVer David Bott shows you his Drainmaster system.
Why you should close your RV's gray tank when hooked up.