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Putting a drain valve on an air tank

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by RF
(calgary, canada)

How to put a drain valve on air compressor? Hi Bill, I’ve got a compressor that doesn’t have a drain, can you please give me some advice how i could add a drain valve on my compressor? Thanks


RF, it is odd to have a compressor tank without a drain, as every time a compressor runs, it’s pumping water into the tank too. Be good if you would upload a photo of the tank for all to see.

Assuming it is a bona fide air tank that you have, then the process would be, with the tank empty of air completely of course…

  • acquire the tank drain
Air compressor tank drain
Basic air compressor tank drain
  • drill a 1/4-3/8″ hole into the tank at the lowest spot on the tank
  • figure out what the male thread size is on the drain
  • weld a nut of the appropriate size to the exterior of the tank, over the hole (the weld must be pressure resistant up to the tank burst pressure – not a job for an amateur
  • thread the drain into the nut thread using an appropriate sealant

Or, get a compressor tank that is already so equipped and relocated your pump to the new tank.

Good luck. Let us know how it turns out, will you?

By Bill Wade

About Air Compressors has been helping folks with their Air Compressor Problems since 2002 online. We're a community of DIY and Compressed Air professionals who are keen to support everyone across the globe with their air compressor issues and troubleshooting. Whether you're trying to identify an old air compressor, or troubleshoot an error code on a sophisticated new industrial air compressor - the community at About-Air-Compressors.com is here to help you

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