The Pro-Series Drain Master Valve Kit 5933
This Kit is one of the three 'Ultimate' Triple kits, and includes everything to install 3 valves for 3 holding tanks operated from 2 Double Switch Panels and 2 Single Rocker Style Switches
Functionally the 5933 kit is the same as that seen on: www.rvtravel.com
but offers 3 valves, 2 Double Switch Panels and 2 Single Switches, IP66
Have 4 tanks on your RV?