Originally Posted by IrregularPulse
What I have found when doing stuff like this....TAKE YOUR pieces with you. That way you don't get home with crap that don't fit and the store is closed. Cause there are several TYPES of fittings whose same sizes don't mesh with each other as well.
+1. Your going to have difficulty getting the right size tubing if you don't have your parts, because as I said they are named by OD and not ID, which ID would be what you are measuring if your measuring the barbs you have to get onto.
In all honesty though I think heat and elbow grease will get you there with one tube. I looked at my set up from Northern Brewer, which is a Whisper pump, and it appears to be just like yours. I got my pieces together this way, but be advised I couldn't pull them apart. Easily fixed however, by cutting a split in the hose under the barb when needed and I have enough hose to last a life time on what they sent.