- Analox
 - Provides sensor technology and hyperbaric, diving, and medical applications. - Aroplus
- Products include diaphragm pumps, lubrication equipment, valves, and cylinders.
- Chell Instruments Limited
- Manufacturers and suppliers of vacuum and pressure measurement, calibration, and control equipment.
- Hale Hamilton Valves
- Manufacturer of valves pressure regulators and high purity gas systems. Specialists in air breathing systems, oxygen systems and pneumatics.
- Instrument Product Services (IPS) Ltd
- Manufacturers of excess flow valves.
- Leeds Valve
- Rotary valve design and technology.
- Lysbor Valves
- Manufacturers of plastic and metal valves for a wide variety of applications and industries.
- Rotork plc@
- Sirco Controls Ltd
- Manufacturers of pressure, vacuum, and temperature control switches as well as sampler systems for effluent, sewage, streams, and industry.
- Spirax Sarco - United Kingdom & Eire
- Provides steam users with knowledge, service, and products to improve and maintain steam heating and process plants.
- Titan Enterprises Ltd
- Manufacturers of liquid flowmeters from gear to turbine-type meters. Specialises in OEM applications tailor-made to individual company specifications.
- Torbar Flowmeters Ltd (TFL)
- Specialises in the Torbar averaging pitot flow sensor and Tribar total meter package.
- Worcester Controls
- Produces valves and actuation for use in process control.
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