Welcome to SYI Group
1. About Our Ductile Iron Precast Concrete Manhole :
- Ductile Iron
- Hinge Type (available)
- Single seal / Double seal (available)
- Lock(available)
- Closed key hole (available)
- Recessed type (available)
- Two lifting Key holes (available)
- Double triangular (available)
- Cut-corner Design (available)