Any way that these would go:
http://www.cooltechnica.com/Merchant...egory_Code=SWS
If it is 3/8" ID tubing then they should. If it is 3/8"OD tho I guess you'd need these:
http://www.cooltechnica.com/Merchant...egory_Code=TAF
Or a piece of 3/8" copper pipe