heres some stuff, doing it this way is bulky, and will need 3 pieces, the adapter to 1/8th pipe, a 1/8th pipe 90º and a straight 1/8 pipe to 3/8 barb for your return line, or you can go 1/8 pipe to #6 for return
heres the only specialty fitting needed, the others you can get at napa or kragen or something
theres a straight 5/16-24 o ring fitting
http://fittingsandadapters.stores.ya...ortofempi.html