Add an extension if you need extra room. Extension is 6" tall. Valve BOX and Valve COVER are NOT included with the EXTENSION.
NDS-113-6 Standard Valve Box Extension
Above diagram is of the COVER ONLY (Not Included with Extension)
This diagram reflects the VALVE BOX (NDS-113BC) that the EXTENSION fits. Valve BOX is NOT included with the EXTENSION. Use these dimensions to determine if the EXTENSION will properly fit your current valve BOX.