"____m___~¿Ô___m____" wrote in message
...
Can't remember if an extra wire was used from your backlights or
whatever.
That would be for electric brakes.
Here the poster is asking about a hydraulic serge brake.

No, they are available for surge brakes also. I have it on my trailer,
works great.

Here is a link to a place you can buy one:
http://www.championtrailers.com/REVE...OID_VALVES.HTM

Rod