3/8" ID soft silicone tubing will go right over 1/2" stubs. Other tubing may work fine as well (try putting in hot water first to soften).
I've swapped a couple of systems from 3/8 to 1/2 ID tubing and saw no difference in MBM-reported die temps. I made a point of not dismounting/remounting the wb on one of the systems to make sure I wasn't confusing the issue with a slightly better/worse mount. Hadn't bothered to with the first system as it's a PITA to change hoses with the wb in place...
noise trivia: I've noticed that the 3/8 soft silicone does a better job of not transmitting pump vibrations than the 1/2 (both thickwall tubing).
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