| LAND DRAINAGE PIPES | HEPWORTH CLAY & TERRACOTTA |
| NAYLOR |
| WAVIN |
| LAND DRAINAGE PIPES AGREMENT CERTIFICATE HOLDERS | WAVIN |
| LAND DRAINAGE PIPES Agricultural | HEPWORTH CLAY & TERRACOTTA |
| WAVIN |
| LAND DRAINAGE PIPES BS 1196:1989 | HEPWORTH CLAY & TERRACOTTA |
| LAND DRAINAGE PIPES BS 4962 Kitemark | POLYPIPE BUILDING PRODUCTS |
| WAVIN |
| LAND DRAINAGE PIPES HDPE | NAYLOR |
| LAND DRAINAGE PIPES Kitemarked | NAYLOR |
| LAND DRAINAGE PIPES Plastic PVC-u Coil | HOWARTH TIMBER GROUP |
| WAVIN |
| LAND DRAINAGE PIPES PVC Coiled Pipe | WAVIN |
| LAND DRAINAGE PIPES Vitrified Clay BS 1196:1989 | HEPWORTH CLAY & TERRACOTTA |
| LAND DRAINAGE PIPES Vitrified Clay BS EN 295 | HEPWORTH CLAY & TERRACOTTA |
| LAND DRAINAGE PIPES Vitrified Clay BS EN 295-1:2013 Kitemarked CE Mark | HEPWORTH CLAY & TERRACOTTA |
