[g.l.amour]

silly question, but when you upgrade to 1/2, you are giving the 1048 a real run for its money. i'm not saying that it can't handle it, but do yourself a favour, and chk if you have some flow.

i once did some upgrading in tubing diameter and although the overal flow resistance dropped, the 1048 had real trouble priming the airbubbles out of the loop. look at it this way, the overal volume of displaced water might increase a little but the velocity of the water will drop after increasing tubing diameter, with the velocity dropping at +/- the same percentage of your tubing increase (+/- 1/3), it might be the proverbial drop that spills the bucket. for all you know you might have some airpockets in crucial component areas (rad, wb?).