sea clone valve

hey all!

i'm new to this, and unfortunately i have a sea clone skimmer. i've read several threads and visited some links relating to modifying these skimmers. unfortunately, i have not come up with a better air valve at any of my local marine aq. stores. they actually have never heard of changing this valve, although one shop actually had the same exact looking valve.
anyway, where can i find an air valve for this thing?

thanks!

thanks! i'll see if i can find one. the one place had alot of parts and acc., but maybe if i look for a " powerhead air" valve, not a skimmer valve, i can find one

great! that's what i need to know when looking!
thanks guys!