Cathar!, sorry, you're right. I always took a 1/2inch barb to mean 12mm inner, they're not!. the outside diametre of my maze3;1 '
1/2inch' barbs is'nt even 1/2inch!!.
So a 1/2 barb is 12mm
outer diametre, with a 10mm inner.
It gets confusing seeing 3/8tube advertised as 10mm inner. so infact 1/2inch barbs would be better fitted with 3/8Tube!!, at least the flow would be constant: 10mm > 10mm, Looney!!
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Seeing this I can understand why the block is 'so' restrictive, it really needs a 12mm inner diametre barb to utilize the full flow
.
The first block I make will definatly use 3/8 thread!!. why are'nt the manufacturers doing this! :shrug: , Crazy!...