Tetraflow Underground soil pipe 110mm square hopper

For use in gravity drainage and sewerage systems, underground drain pipe and fittings can be installed to depths of up to 10 metres. The range is manufactured from uPVC for added strength and its ability to be resistant to moisture and is suitable for both domestic and commercial solutions.

BSI Kitemark Certification

TetraFlow’s popular products are manufactured to the most stringent quality guidelines under the BSI Kitemark certification.

QMS (Quality Management System)

TetraFlow is certified by the British Standards Institute to operate a ISO9001:2015 quality management system for continuous improvement.

Leading International Standards

TetraFlow’s product range is equivalent to the relevant BS, EN and ISO standards, which include:

BS EN 1329 / BS EN 1401 / BS 4514 / BS EN 1451 / BS 5255 / BS 4660 / BS 4576 / BS 4607 / ISO 3633

Raw Materials

TetraFlow uses the highest quality raw materials and chooses to work with superior raw materials and established suppliers. Our quality process starts with the inspection and testing of incoming raw materials.

• 110mm uPVC
• Ring seal joints
• Suitable for gravity drainage & sewerage
• Install up to depths of 10m