Oceanic Biocube HQI 29 Gal Flex tubing

[Chubby]

Hola Fellow reefers, i had to take down my tank 2 years ago because of a flood in my house. all my livestock and corals went to my buddies for safekeeping. Today i am trying to set it up again and noticed that the flex tubing that connects to pump to the return head went missing. Does anyone know the size of this tubing? The original owners manual doesnt say but  the newer ones that come wiht led say .5" but that doesnt seem right. I am bad with measurement so could use some confirmation from anyone who can confirm.

THanks!
Chubbs

[Water Dog]

1/2 inch tubing works, here is the original OEM part...

 

http://www.ebay.com/itm/331626470843?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

[Chubby]

Ty!