This document is the Grate Riser Extension - Road & Highway Quick Spec Installation Nyloplast Detail. Details with illustrations shown.

The road and highway grate extension shows the ductile iron grate, the ductile iron grate riser extension, asphalt resurfacing, asphalt above concrete slab and the integrated ductile iron base plate to match basin.

Note 1 states that grates/solid covers shall be ductile iron. Note 2 states frames shall be ductile iron. Note 3 says that grate riser extensions shall be ductile iron. Note 4 states that dimensions are in inches.

A chart features frame size, extension height and part number for 2’ x’ 2’ and 3’ x 3’ road and highway extensions.