Ultra Silent is an effective, non-pressure soundproof wastewater and drainage piping system made of mineral-reinforced polypropylene compound. It has three layers to provide the highest mechanical performance and offers the best measured acoustic insulation of 19db at 4l/s. The system also allows for enhanced flow rates due to its smart, progressive design and full range of fittings, while maintaining high temperature resistance up to 95C long term and 98C short term.