The product which launched the company, the RSV or Rotary Selector Valve, is as unique today as it was at inception. It is a relatively simple and therefore extremely reliable unit, based on a modular design and as such configurable for a multitude of applications. 

Each Rotary Selector Valve bank is pneumatically independent but linked by a common central spindle, enabling separate air paths to be controlled concurrently; each output is effectively a valve. 

Positive Positioning comes from an indexing mechanism allowing the operator to have a genuine feel of the valves various positions, eliminating the possibility of the valve being left in mid position. Flexibility comes from the fact that each valve can have its own unique inner spindle, so with multibank valves each bank can have its own configuration.