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Hi all,

My suction Y-pipe was leaking from all 3 ports and the valve, and I replaced it with the brand new Honda part.
Lubricated O-rings with AC oil of course, took off the old pipe, noticed how little torque the nuts required, and tried to reproduce about the same torque when installed.
After 2 months the system ran out and the leak is through the top port near the firewall, i.e. to the front evaporator. The AC side port and the lower port to the rear evaporator do not have leaks.

I want to understand what seals the port - the O-ring only, or the contact between the Al pipes too? Should I replace the O-ring on the leaking port, or tighten it stronger, or else?
 
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