The Naylor DENSLEEVE underground drainage system of DN100, 150, 225 and 300 (200 and 250 for Continental Markets) plain-end vitrified clay pipes and fittings with flexible sleeve couplings, was developed for building drainage and associated sewerage and is manufactured to comply with the stringent requirements of BS EN295.

Densleeve pipes can usually be laid directly on a hand trimmed natural trench bottom with selected, excavated materials (Class D Bedding) used as backfill.

Vitrified clay plain-end pipes and fittings, manufactured in accordance with the requirements of BS EN295-1

Sleeve Couplings are manufactured in high impact polypropylene with elastomeric seals providing watertight, flexible mechanical joint assemblies, complying with BS EN295-1: System G.

Standard Coupling Seals are manufactured from elastomers conforming to the performance requirements of BS EN681-1.

It is a major advantage of the Densleeve system that the plain-end pipes can be quickly and easily cut to intermediate lengths on site and can still be jointed using the flexible couplings. This feature retains the ease in jointing, reduces wastage and damage and is particularly cost effective.

Originally developed in DN100 and DN150 specifically for "Round the Building" drainage, the range now includes DN225 and DN300 pipes and fittings for sewerage and road drainage applications, plus DN200 and DN250 developed for Continental European Markets.

The flexible joints ensure that the pipeline will accommodate minor settlement and ground movement - without failure. Vitrified clay pipes and fittings are rigid and do not distort under loading. Their high inherent strength ensures stability under even the highest loadings.