11723 Strasburg Bolivar Rd. NW
American Highway Products has been manufacturing the highest quality adjusting rings since 1978. The "Pivoted Turnbuckle Manhole Riser", patented valve box risers and catch basin risers all start at ¾” and go up in ¼” increments. The Manhole Safety Ramps eliminate patching around manholes by using a solid rubber ramp.