The Pro-Series Drain Master Valve Kit 5932
This Kit is one of the three 'Ultimate' Triple kits, and includes everything to install 3 valves for 3 holding tanks operated from 6 Single Rocker Style Switches
Functionally the 5932 kit is the same as that seen on: www.rvtravel.com
but offers 3 Valves and 6 Single Switches, IP66 Waterproof.
Have 4 tanks on your RV?