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12/16mm = 1/2 inch

16/22mm = 5/8 inch

inner circumference
 

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I would suggest using something to hold the 1/2 inch pipe on to the barbs, like a banded hose clamp or something. Would hate to see one pop of.
 

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You can just type in "x units to y units" in google and it will tell you. ie "12 mm to in"


If you need to replace it, try to avoid the flimsy vinyl tubing sold at HD/lowes. You need stuff that won't kink so easily. I used reinforced tubing (has some sort of material woven through it) and it works great.
 
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