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![three-way valve](https://images.findtheneedle.co.uk/findtheneedle/products/2654737.jpg)
When EHC HT is for double use (inside & outside) a three-way valve can be mounted in front of the filter, this makes it possible for the filter to be switched off when driving outside.
The EHC 3-way valve can be manual or electric. When electric the driver can control the valve from the driver?s seat. A control lamp will indicate which position the valve is in.
For more information on three-way valve talk to KC Exhaust Filters
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