Flowtite GRP manholes are made of glassfiber reinforced unsaturated polyester resin. They include a liner with glassfiber reinforcements for an expected higher chemical pollution of municipal wastewater. Shaft and chamber units comply with the requirements of EN 14364 and EN 15383 for underground drainage and sewage.

Flowtite manholes are custom-tailored to all sorts of operation requirements. In the case of deep installations as required e.g. on landfill sites, the manholes are designed with a bigger wall thickness to increase the structural stability.