Manholes can be manufactured using a variety of materials including precast concrete, plastic, and fiberglass. The chosen manhole material can vary based on a variety of factors including the shape of the manhole and the intended manhole function. Depending on the material that is chosen, the manufacturing process will vary. Due to technological advances in recent years, fiberglass and plastic polyethylene models have increased in popularity, as they have many advantages over traditional precast concrete manholes. In this section, we discuss the construction of manholes, including plastic manholes, precast manholes, and fiberglass manholes.