Category F Fittings
| Electric Level Controllers | Pathway Control Products Inc. |
| Flow Meters | Amvex Corp. |
| Flow Meters | Brooks Instrument |
| Flow Meters | Rota Yokogawa Gmbh & Co. |
| Flow Meters | Yamatake Corporation |
| Flow Transmitters | Kurz Instruments Inc. |
| Flow, Level, Temperature and Pressure Gauges | Krohne Altometer |
| General Measurment Devices | Abb Automation Products Gmbh |
| Glass Magnetic Level Gauges | Clark-Reliance Corp. |
| Level and Flow Gauges | Kenco Engineering |
| Level Gauges | H.A. Phillips & Co. |
| Level Gages, including RWA-17 Weld Pad Style | Inferno Manufacturing Corperation |
| Level Gauges and Transmitters | Orion Instruments |
| Level Sensors | Ohmart/Vega Corporation |
| Level, Pressure and Temperature Gauges | Ametek Process Instruments |
| Pressure Gauges and Calibrators | Crystal Engineering Corporation |
| Pressure Gauges and Transmitters | Anderson Instrument Company Inc. |
| Pressure Gauges, Transmitters and Switches | Ashcroft Inc. |
| Pressure Sensors | Fuji Electric Systems Co. Ltd. |
| Pressure Transmitters | Kistler Instrumente Ag |
| Pressure, Flow and Level Gauges | Asv Stuebbe Gmbh & Co. Kg |
| Process Instrumentation | Baumer Bourdon Haenni Sas |
| Process Instrumentation | Cameron, Measurement Systems Div |
| Process Instrumentation | Emerson Process Management, Rosemount Analytical |
| Process Instrumentation | Endress & Hauser Flowtec Ag |
| Process Instrumentation | Hansen Technologies Corporation |
| Process Instrumentation | Honeywell International Inc. |
| Process Instrumentation | K-Tek, Llc |
| Process Instrumentation | Quality Machining & Metal Works Inc. |
| Process Instrumentation | Siemens Ag |
| Process Instrumentation | Sor |
| Process Instrumentation | Telematic Controls |
| Process Instrumentation | The Wellmark Company |
| Process Instrumentation | Winters Instruments |
| Process Refractometers | K-Patents Oy |
| Pulsation Dampener, Pressure Gauges and Limiting Switches | Mid-West Instrument |
| Pulse Burst Radar Transmitter, Magnetic Level Gauges | Magnetrol International Inc. |
| Sight Glasses and Liquid Level Gauges | L.J. Star Incorporated |
| Sight Glasses up to 6″ dia | Itt Richter Chemie-Technik Gmbh |
| Sight Glasses up to 8″ dia | Neotecha Ag |
| Thermowells | Daily Thermetrics Corp. |
| Thermowells | Endress+Hauser |
| Thermowells | Mac-Weld Machining Ltd. |
| Ultra Sonic Flow Meter | Sick Engineering Gmbh |
| Various Sight Glasses | Pressure Products Company Inc. |