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leaks like these are why i use bathtub silicone sealer on the joints, its cheap, easily removable in the future, and ends all leaks.
clean and dry all connections totally, let parts sit to dry or use a hairdryer or heat gun so no moisture remains!
Then butter up the pieces and assemble, let dry a hour or so and dont overtighten fittings which are really cheap junk quality to begin with, and can distort if over tightened.
end of leaks forever:)