|Butterfly Valve for oil coolers works with the TCW Control Valve Servo Kit.|
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The duct diameter of 11-11299 is 3". We have added to this web page 11-11555 which is 4" duct.
Yes, it is made from 6061T6 aluminum and can be welded.
It is not attached but it does come with the unit in a bag.
The length is approx 2.75".