This alternative to a traditional manhole riser has been specified by cities and contractors in 26 states and Canada. Ideal for gaps of less than 1 in., the Road Smoothie is made of neoprene rubber and recycled tires and attaches to the top of manholes, water meters, or other belowgrade frames to elevate the structure to road or sidewalk level. Less noisy under traffic than metal riser rings, it doesn’t warp, and is gentler on tires. Road Smoothie LLC. 801-414-3220.