Buyer's Guide
| Company | Location | Company Type |
|---|---|---|
| O3 Water Systems, Inc | Cle Elum | Manufacturer |
| Oetiker, Inc | Marlette | Manufacturer |
| Ogden Manufacturing Co. | Pittsburgh | Manufacturer |
| Ogontz Corp. | Manufacturer | |
| Oil-Rite Corp. | Manitowoc | Manufacturer |
| Omexell, Inc. | Houston | Manufacturer |
| Omnipure Filter Co. | Caldwell, Idaho, United States | Manufacturer |
| Opella, Inc. | Marietta | Manufacturer |
| Orival, Inc. | Englewood | Manufacturer |
| Osmosis Techonology, Inc/Osmotik | Buena Park | Manufacturer |
| Ozone Pure Water | LEANDER | Manufacturer |
| Ozonology Inc. | Northbrook, Illinois, United States | Manufacturer |
| Ozotech, Inc. | Yreka | Manufacturer |
| Pacer Pumps Div of ASM Industries | Lancaster | Manufacturer |
| Pacific Ozone Technology | Benicia | Manufacturer |
| PACO Pumps | Brookshire | Manufacturer |
| PACS Testing & Consulting | Coraopolis | Manufacturer |
| Palintest | Erlanger | Manufacturer |
| Pall Corporation | Port Washington | Manufacturer |
| Parker Fluid Control Division | New Britain | Manufacturer |
| Parker Hannifin Corp./ Brass Products Division | Otsego | Manufacturer |
| Parker Hannifin Corporation | Otsego, Michigan, United States | Manufacturer |
| Parkline, Inc. | Winfield | Manufacturer |
| PayneUSA | Temecula | Manufacturer |
| PCB Piezotronics, Inc. | Depew | Manufacturer |
