Manholes are a constant on underground utility projects, but not all installs are created equal. While concrete manholes have been the industry standard for decades, newer polyethylene systems like the Poo Pit are changing how crews approach installation.
The biggest differences aren’t philosophical — they’re practical. Equipment needs, handling, alignment, and inspection readiness all play out differently once the structure hits the trench.
Here’s how the two compare in real-world installation scenarios.
1. Equipment Requirements
Concrete Manhole
- Typically requires larger excavators or cranes
- Heavier lifts demand careful rigging
- More setup time before placement
Poo Pit
- Lighter weight allows placement with smaller equipment
- Faster mobilization and simpler rigging
- Better suited for tight or restricted jobsites
For contractors, equipment size affects access, scheduling, and cost — especially on urban or retrofit projects.
2. Handling and Placement
Concrete Manhole
- Limited flexibility once placed
- Fine adjustments can require re-lifting
- Heavier sections increase physical strain on crews
Poo Pit
- Easier to position and align in the trench
- Lighter material allows more controlled placement
- Faster final adjustments
Reduced handling effort means less fatigue and more consistent installs across the day.
3. Inlets, Outlets, and Alignment
Concrete Manhole
- Field coring or adjustments are sometimes required
- Alignment depends heavily on site conditions and tolerances
- Modifications can slow production
Poo Pit
- Inlets and outlets are engineered to project specifications
- Pipes align closer to plan
- Less need for cutting, grinding, or patching
Pre-engineered connections help eliminate guesswork once crews are in the trench.
4. Sealing and Inspection Readiness
Concrete Manhole
- Relies on joints, grout, or boots
- Vulnerable to cracking or infiltration over time
- Inspections may focus on joints and connections
Poo Pit
- Seamless polyethylene body
- Integrated seals designed to stay watertight
- Cleaner installs that are easier to inspect
Passing inspection the first time keeps projects moving and avoids rework.
5. Safety and Crew Impact
Concrete Manhole
- Heavier lifts increase risk during placement
- More strain during alignment and adjustment
- Fatigue can build across repetitive installs
Poo Pit
- Reduced lift weight lowers placement risk
- Easier handling improves crew control
- Less physical wear over the course of a project
Safer installs often translate directly into better productivity.
6. Schedule and Cost Implications
Concrete Manhole
- Slower placement per structure
- More time spent on field adjustments
- Higher equipment and labor demands
Poo Pit
- Faster installs
- Smaller crews and equipment
- More predictable production rates
Small efficiencies compound quickly on projects with multiple installs.
Choosing What Fits the Job
Concrete manholes remain a viable solution in many applications. But for projects where speed, safety, alignment accuracy, and long-term performance matter, polyethylene systems offer clear installation advantages.
For contractors, the difference shows up where it matters most: fewer headaches in the trench, smoother inspections, and jobs that stay on schedule.
Because the best installs aren’t about tradition — they’re about what works best in the field.
Visit our YouTube to watch all of our Poo Pit installation guides.
