Manhole Risers (Grade Rings)

C-18 Grade Rings – 635 mm (25″) Opening

#0390 – 50 mm – 150 mm Grade Ring – 635 mm Op

C-44 Grade Rings – 762 mm (30″) Opening

#0391 – 50 mm – 150 mm Grade Ring – 762 mm Op

C-23 Grade Rings – 940 mm (37″) Opening

#0392-4 – 100 mm C-23 Grade Ring – 940 mm Op

Miscellaneous

#0393 – Manhole Blocks