i drilled 2 holes in the arm about 10cm apart (i didn't exactly measure, its a guestamate) then i put 2 rubber gromets in it. The right angle parts i used 2 small pieces of stainless steel pipe bent them carefully in a vice and intake done.
If anyone else wants to do them i'm sure you can use either brass or copper right angles from a pumbing supply, in case you don't have the stainless steel piping. Brass would prob be better out of the 2 as it doesn't corrode. Copper sometimes goes green if there is water & air present, but i think it this sealed application should be fine.
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