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Old 22-01-2011, 06:20 PM   #1997
Senior Member
Join Date: Oct 2004
Posts: 1,900
Should be inside diameter.
Btw, evening for commerical aircon they use 20/25mm for 3-5 fancoils sharing a single drain pipe.
32mm not fesible for home use as even the fancoil itself supplied flexible drainhose is 13mm only...
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