This product arrived very quickly and fits 14mm pipes, NOT 12mm pipes. Small cases can be a bit difficult to fit, but overall it screws in like butter once aligned. The material is a nice and heavy metal. I would choose metal over plastic right angles for durability. I don't know what heat means, but metal keeps the coolant cold in the facility without fear of leaks. When you install the tube properly you will feel a slight click to let you know it is fully seated.
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