Watertight Manhole Classification Levels
Watertight Manhole Levels of Classification
Watertight manhole levels are classified as follows:
| watertight Level | ABBREVIaTION | Description |
|---|---|---|
| Watertight Level 1 | L1 | Mechanically compressed gasket between frame and solid cover intended to resist incidental surface water infiltration or odor release. No pressure or head rating. Designated products only. |
| Watertight Level 2 | L2 | Assembled unit has been tested and can withstand a 1/2 atmosphere of pressure (7.35 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 3 | L3 | Assembled unit has been tested and can withstand 1 atmosphere of pressure (14.7 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 4 | L4 | Assembled unit has been tested and can withstand 1-1/2 atmospheres of pressure (22.05 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 5 | L5 | Assembled unit has been tested and can withstand 2 atmospheres of pressure (29.4 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 6 | L6 | Assembled unit has been tested and can withstand 2-1/2 atmospheres of pressure (36.75 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 7 | L7 | Assembled unit has been tested and can withstand 3 atmospheres of pressure (44.10 PSI Gauge) internal or external. Designated products only. |
| Watertight Level 8 | L8 | Assembled unit has been tested and can withstand 3-1/2 atmospheres of pressure (51.45 PSI Gauge) internal or external. Designated products only. |
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