O-ring for Renzetti Traveler

[whatfly]

Does anyone know the dimensional designation for the proper size O-Ring so I could order a couple from a hardware store? Thanks

According to past threads, looks like 3/8" inner diameter:
http://www.flyanglersonline.com/bb/s...+ring+renzetti
http://www.flyanglersonline.com/bb/s...+ring+renzetti