Those CPC ones are the only ones i have come across in the UK, i've been looking for ages for a cheaper alternative, because i'd love the ability to disconnect my external rad, but i can't justify teh money.
Also, those couplers, you can get them self sealing, but i could only see evidence of one side sealing, for example in a pneumatic line, where you want the oompresson side to be sealed, but the air in the rest of the circuit can escape. This would be no good for a liquid. I also couldn't find them in 1/2" either!!
Hope someonoe else has some better alternatives!!
Kristian
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