Black polypropylene, HDPE air tested for sealed systems. The SVR reducers are available straight, flat back and coned. Standard nominal bore.
All fittings can be adapted to accept twin wall, PVC, steel, concrete or clay pipes, to join any pipe to any pipe. e.g. sewer to twin wall.

Twin wall pipe fittings are manufactured using the following nominal bore standard diameters.
Larger bore fittings are fabricated using smooth inner and outer wall pipes to the following nominal bore diameters.

All level, invert, socketed and plain ended reducers can be manufactured to customer specification.