A fitting for joining together with a tight seal at least two pipe sections, the fitting comprising a hollow tubular main body with opposite tubular sleeve openings, wherein a first tube end of a first tube and a second tube end of a second tube can be inserted in the respective opposite tubular sleeve openings. The fitting comprises a first pair of circumferential sealing zones comprising a proximal sealing zone and a distal sealing zone, for sealing said first tube end to the fitting, and a second pair of circumferential sealing zones comprising a proximal sealing zone and a distal sealing zone, for sealing said second tube end to the fitting. In between said first pair of circumferential sealing zones is arranged a first circumferential pressure chamber, having an inlet, which can be used to test the integrity of seals in said first pair of sealing zones. In between said second pair of circumferential sealing zones is arranged a second pressure chamber, having an inlet, which can be used to test the integrity of seals in said second pair of sealing zones, sealing means to form circumferential seals at each respective sealing zone. The fitting comprises forming at least a first cold zone in between said first pair of sealing zones, and at least a second cold zone in between said second pair of sealing zones, and at least one proximal cold zone in between said first and second cold zones.
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