http://www.typeworkshop.com/index.php?id1=Providence_03_2005&id2=day2&id...

This might help for DIY inspiration
Or for the readymade solution
http://www.myfonts.com/search?search%5Btext%5D=pipes

Tim

What about this fella?

All great and extremely viable options, but let me throw a wrench in the works (pun intended). I was hoping for some lowercase options. :-)

May I recommend using something else, type wise, than falling for the 'Waterpipefont' cliché? :) ( Using such a typeface to set / create a 'plumber' logo sure sounds more than just cheesy. )

Dav

http://www.myfonts.com/fonts/t26/phuture-odc/

http://www.myfonts.com/fonts/characters/vagebond/

Might come down to amending a font like these or DIY
Tim

I would absolutely love to, but the client is pretty excited about the concept he came up with. I'm offering several other logo options, but I would be quite negligent if I didn't use his idea as one of the options.

You should always try to educate your clients. :) ( Well, I know it sounds waaay easier than it is, in real life. But on the other hand, clients almost always choose the cheesiest, lowest quality one of the presented logotypes. Trust me. :)

Dav

I agree, formlos, and I usually do try to educate the client, but there are quite a few unique circumstances in this particular instance. However, there are very clever, creative ways of encouraging a client to avoid the cheesy design that they initially wanted and instead pick a classier, better designed option (for example, "oh, gee, there are just no fonts that include lowercase letters you wanted...here's a version with pipe fittings in uppercase, but look at this other design over here - it includes the lowercase you wanted, blah, blah, blah").

Thanks for all the help, everyone! You've given me a lot of really good ideas.