I had my local hose shop make me up a 3/4" ID rubber hose with some 1/2" or 3/4" npt fittings on the end.
I then used these 'unions' that allow them to spin, and they have a sealing edge on the inside.. I think they were $5 each or something..
http://img.tootoo.com/mytootoo/uploa...09ef7fef4d.jpg
Look like that.. Except mine are uglier cast iron ones.