Notes:

1) Any prebenched manhole with four (4) or more openings will be charged as a cul de sac manhole.

2) Approved drawings are required for manufacture of all prebenched manhole bases.

3) 813 mm from invert to top of base except for 600 mm diameter concrete pipe – 965 mm.

4) 600 mm available in straight through, 90 degree tee and 90 degree cross configuration only.

5) All prebenched manholes (other than 600mm) available for concrete and PVC pipe and in 45 degree branch angle increments. Other angles accommodated through flexibility in connection of pipe with manhole or an oversized hole.

6) Prebenched manholes come complete with circular cast in rubber gasket for SDR 35 PVC pipe.

7) Excessive PVC pipe deflection under earth load may cause leakage between the pipe & gasket. Lafarge can correct this leakage on site for a charge per manhole.

8) Adapter to SDR 35 PVC pipe required (by Contractor) for Ultra Rib PVC pipe.