The following navigation utilizes arrow, enter, escape, and space bar key commands. Left and right arrows move across top level links and expand / close menus in sub levels. Up and Down arrows will open main level menus and toggle through sub tier links. Enter and space open menus and escape closes them as well. Tab will move on to the next part of the site rather than go through menu items.
The Zurn Wilkins 310 Single Detector Check Valve prevents the reverse flow of non-hazardous substances into the water supply. The 310 is used to protect upstream equipment, and is not adequate for low or high hazard backflow prevention.