1) I'd like to have it drain automatically. This description of
installing an automatic drain seems fairly straightforward:
http://www.paragoncode.com/shop/compressor/
Is there a better product? Comments on this product or the procedure he
describes?

I have one on my 20 gallon compressor and it works great but I also had the
problem with the cheap plastic tubing overheating and blowing out. I
replumbed it with 1/4" copper tubing but I had to couple that to the plastic
tubing near the valve with a compression coupling because the valve can only
connect to plastic tubing as someone else mentioned.

I complained to Harbor Freight about the tubing and they refunded the full
purchase price to me and let me keep the kit so I ended up getting mine for
free! :-)

Otherwise I've been very happy with it and never had to touch it since it
was installed about 4 years or so ago.

Just a guess but it may be possible that the autodrain won't drain enough
from your tank because it's so large.

Best Regards,
Keith Marshall


"I'm not grown up enough to be so old!"