| PIPE COUPLINGS | ACO TECHNOLOGIES PLC - BUILDING DRAINAGE |
| ALIAXIS UK |
| ALUMASC WATER MANAGEMENT SOLUTIONS |
| BLÜCHER UK LTD |
| FERNCO LTD |
| GEORGE FISCHER SALES LTD |
| HEPWORTH CLAY & TERRACOTTA |
| HUNTER PLASTICS LTD |
| MARLEY PLUMBING & DRAINAGE |
| MARSHALLS CPM |
| NAYLOR DRAINAGE PRODUCTS LTD |
| OSMA |
| PAM BUILDING |
| PEGLER |
| POLYPIPE BUILDING PRODUCTS |
| POLYPIPE TERRAIN LTD |
| PIPE COUPLINGS Acoustic | OSMA |
| PIPE COUPLINGS Adaptors | ALIAXIS UK |
| BLÜCHER UK LTD |
| CLARK DRAIN LTD |
| DALLMER LTD |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| OSMA |
| PAM BUILDING |
| PEGLER |
| POLYPIPE BUILDING PRODUCTS |
| PIPE COUPLINGS Adjustable Socket | FERNCO LTD |
| PEGLER |
| PIPE COUPLINGS AGREMENT CERTIFICATE HOLDERS | ALUMASC WATER MANAGEMENT SOLUTIONS |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS BS EN 295 | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS BS EN 295-4:2013 Kitemarked | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| PIPE COUPLINGS BS EN 681-1 | ALUMASC WATER MANAGEMENT SOLUTIONS |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Cast Iron | FERNCO LTD |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PAM BUILDING |
| PIPE COUPLINGS Chemical Resistant | ALIAXIS UK |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Clay Pipes | HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Concrete Pipe | FERNCO LTD |
| PIPE COUPLINGS Ductile Iron | PAM BUILDING |
| PEGLER |
| PIPE COUPLINGS EDPM Rubber BS EN 295-4:2013 CE Marked | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| PIPE COUPLINGS EDPM Rubber BS EN 681-1 | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Electrofusion | ALIAXIS UK |
| POLYPIPE TERRAIN LTD |
| PIPE COUPLINGS EPDM / SBR Rubber | CLARK DRAIN LTD |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Flexible | ACO TECHNOLOGIES PLC - BUILDING DRAINAGE |
| ALUMASC WATER MANAGEMENT SOLUTIONS |
| CLARK DRAIN LTD |
| FERNCO LTD |
| Hep2O PUSH-FIT PLUMBING |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| OSMA |
| PEGLER |
| POLYPIPE BUILDING PRODUCTS |
| POLYPIPE TERRAIN LTD |
| PIPE COUPLINGS Internal Connection | FERNCO LTD |
| PIPE COUPLINGS Intumescent AGREMENT CERTIFICATE HOLDERS | HUNTER PLASTICS LTD |
| PIPE COUPLINGS Large Diameter | ALIAXIS UK |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PEGLER |
| PIPE COUPLINGS Lateral Connections | FERNCO LTD |
| PIPE COUPLINGS Lateral Connections Large Diameter | FERNCO LTD |
| PIPE COUPLINGS MPA Approved (German Standard) | HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Nitrile | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Nitrile BS EN 681-1 | FERNCO LTD |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Purpose Made | FERNCO LTD |
| PIPE COUPLINGS Repair | ACO TECHNOLOGIES PLC - BUILDING DRAINAGE |
| CLARK DRAIN LTD |
| FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| POLYPIPE BUILDING PRODUCTS |
| PIPE COUPLINGS Sewer | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Spiral Wound Pipes | FERNCO LTD |
| PIPE COUPLINGS Stainless Steel | PAM BUILDING |
| PEGLER |
| PIPE COUPLINGS Steel Pipes | BLÜCHER UK LTD |
| PIPE COUPLINGS VA Approved (Danish Standard) | NAYLOR DRAINAGE PRODUCTS LTD |
| PIPE COUPLINGS Wide Tolerance Range | FERNCO LTD |
| PAM BUILDING |
| PIPE COUPLINGS WIS 4-41-01 Kitemarked | FERNCO LTD |
| HEPWORTH CLAY & TERRACOTTA |
| NAYLOR DRAINAGE PRODUCTS LTD |
| OSMA |
| PIPE COUPLINGS WRC Approved | FERNCO LTD |
