I am new to the site. I just read a comment you made (Jan 17, 2010) about there being lots of directions of how to build a home made hooka surface air system. I must be searching the wrong words. Do you happen to have any links or recall what you 'Googled'? Did you get around to building one yourself? I'll continue 'Googlin'. ;o)

I am looking to find or build a 12v system. I have an 8' x 16' dock/raft with a trolling motor and two very large deep cycle batteries, so that would be an ample power source. I mainly use it for cruising around our bay at happy hour with the neighbors.

OEM units I have found so far:
Sea Breathe (130-D) one man is pricey at$1400. (12 amp draw)
The Hookamax (E2005C-12v) is $750 but draws 45 AMPS!
(I have #8 wire from dual 12v batteries to run the 12v, 30 amp trolling motor. a 45 amp draw might need to change to #6 wire. Not THAT big a deal.)