I had trouble with my 3/8" silicone tubes and an adapter for my rad. The tube didn´t fit tight enough with less than 16 mm hoses. So a 1/2" tube sitting loose on a 13 mm hose shouldn´t be impossible.
Eheim states 17 mm, 3/4" on the site.
http://www.eheim.com/technik_pumpen.htm
regards
Mikael S.
__________________
The only constant factor in all Your failures is You.
Catapultam habeo. Nisi pecuniam omnen mihi habis, ad caput tuum saxum immane mittam.
|