High Quality Culvert Balloon

These are used to create voids or hollow sections within concrete structures such as pipes, culverts, and manholes. They are made from synthetic or natural rubber with fabric reinforcement, giving them strength, elasticity, and flexibility. The forms are inserted into the concrete pour area and then inflated to create the desired shape before the concrete sets. Once the concrete has cured, the forms are deflated and removed, leaving a hollow passage.