Strong Culvert Balloons

600 mm × 9 m Heavy-Duty Inflatable Culvert Balloon (Pneumatic Formwork) ​Product Overview ​Upgrade your culvert and concrete pipe construction with our 600 mm (24") × 9-metre Inflatable Culvert Balloon. Designed as a reusable, flexible pneumatic formwork, this balloon allows contractors to pour monolithic concrete culverts, storm drains, and cable ducts quickly and cost-effectively without the hassle of heavy, rigid steel or wooden shuttering. ​Simply position the balloon inside the trench or mold, inflate it to shape, pour your concrete, and deflate for quick extraction once cured.