| ABC Industries Inc | United States | ||
| Advance Products & Systems | United States | ||
| Anvil International & Smith-Cooper International | United States | ||
| Applied Flow Technology | United States | ||
| Atlas Copco CMT USA Inc | United States | ||
| Blasch Precision Ceramics | United States | ||
| CAB | United States | ||
| CBP Engineering Corp | United States | ||
| Central Plastics Co. | United States | ||
| CertainTeed Corporation | United States | ||
| CF UltraTech | United States | ||
| Chemco Systems | United States | ||
| CoorsTek Technical Ceramics | United States | ||
| Corzan Industrial Systems | United States | ||
| Dallai Ernesto SRL | Italy | ||
| Flaretite | United States | ||
| Flex-A-Seal Inc. | United States | ||
| Flexitallic US LLC | United States | ||
| Georg Fischer Piping Systems Ltd | Switzerland | ||
| GPM Inc. | United States | ||
| H & M Plating Company, Inc. | United States | ||
| Hayward Flow Control | United States | ||
| Helmick Corporation | United States | ||
| Hercules Sealing Products | United States | ||
| Hilti USA | United States | ||
| Indumar Products Inc. | United States | ||
| Industrias Montefiore S.A.I.C. | Argentina | ||
| Integrity Fusion Products, Inc. | United States | ||
| Jabo Supply Corporation | United States | ||
| JCM Industries, Inc. | United States | ||
| JGB Enterprises Inc. | United States | ||
| Kadant Unaflex | United States | ||
| Kamal Import Exports Inc. | India | ||
| Kroy Industries | United States | ||
| Lawson Products Inc. | United States | ||
| McElroy Manufacturing Inc. | United States | ||
| MOGAS Industries Inc. | United States | ||
| Netafim USA - Fresno | United States | ||
| Novitech | Canada | ||
| Paterson & Cooke | South Africa | ||
| Performance Pipe | United States | ||
| Pexgol | Israel | ||
| Plastatech Engineering Ltd. | United States | ||
| Polypipe | United Kingdom | ||
| Purvis Industries | United States | ||
| Saint-Gobain Performance Ceramics & Refractories | United States | ||
| Schaltbau North America | United States | ||
| Schauenburg Flexadux Corp. | United States | ||
| Scotchman Industries | United States | ||
| Shijiazhuang Kingda Pump Industry Group Co Ltd. | China | ||
| ShurJoint Piping Products | United States | ||
| Simtech Process Systems | United States | ||
| SPIRO INTERNATIONAL SA | Switzerland | ||
| Tandem Products Inc./Rhino Hyde Div. | United States | ||
| Thompson Pump & Manufacturing Co Inc | United States | ||
| Torus Pressure Control | United States | ||
| Ultra Tech Pipe | United States | ||
| Val-Matic Valve & Mfg. Corp. | United States | ||
| ValvTechnologies Inc | United States | ||
| Victaulic Company | United States | ||
| Vinidex Pty Ltd | Australia | ||
| Wolseley Industrial Group | United States | ||
| Xylem Inc | United States | ||
| Yamada America Inc. | United States |
