[quote author=zambavi link=topic=4762.msg74980#msg74980 date=1232088955]
Anyone? I'm having no luck here finding a reducer...
[/quote]
I don't think that john guest fittings work well with soft flexible tubing. However, you can use a john guest fitting to adapt to a piece of rigid 1/4" irrigation tubing then use a 1/4" double-barb connector to connect the rigid tubing to the flexible airline tubing.
You can get the rigid tubing and the double-barb connectors in the irrigation section at home depot. The john guest fittings are also at home depot, over with all the brass and nylon fittings and adapters.