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Hamilton Kent - grade rings - frame - cover over manhole subject to vehicle traffic

H-20 Reducer Top manholes are specially designed for installation in areas where vehicular traffic may be present.  Utilizing a specially designed reducer, H-20 Highway Loading manholes are used in conjunction with grade rings, frame, and cover.

Suitable Locations

H-20 Highway Loading manholes are for use in areas where vehicular traffic may be present (roads, parking lots, loading dock areas) or where a low profile installation is required.

Availability

4', 5', and 6' [1.22, 1.52, and 1.80 m] diameter manholes.

Sizing Traffic Reducer Top Manholes

H-20 Highway Loading manholes are sized to be 12-inches [30.48 cm] below the finish grade.  This allows standard grade rings / frame / cover systems to be used to bring the installation up to grade.

Should a manhole be incorrectly and the Top be too far below grade, Openchannelflow offers manhole extensions to help bring the top back up to its desired height.

 


Image:  Hamilton Kent