- Standard cast iron 24″ stackable manhole ring for the 300-24® series covers or grate.
- H-20 traffic rated when properly installed in reinforced concrete and when used with an H-20 rated cover or grate.
- 2-1/2″, 4″, & 6″ cast iron riser rings available.
- All stock items.
- Custom steel risers are available on special orders.
- Uncoated cast gray iron, ASTM A48 CL35B or better, AASHTO M306-10 (M105).
- Made In USA. LEED® certifications available on request.
- Please use the Contact Form or call us to request info & submittal sheets.
- 1-800-258-2278 Toll Free or (972) 263-1360 DFW Local.