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Air Tank Valve Leak

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In the process of draining my rear air tank I noticed a leaking drain valve which is located in the engine compartment. It has an air line connected to it that leads to the air tank. This was confirmed by spraying a soapy solution on the valve. 

Is this as simple as removing and replacing with a new one?  I know that I will need to drain the tank first and will not need to crawl under the coach. 

Is is a replacement easily attainable?

 Thanks for any feedback. 

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Yes, any place that deals in OTR trucks will have DOT approved air valves.

Drain air.

Remove old one.

Take it in to match threads/size.

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