Dear Customer,
The drain tube comes with a fitting which can connect to the reservoir.
Please refer to the following link to see how to drain the water.
https://www.youtube.com/watch?v=K7ecpBJ93rg
If the drain tube you got was wrong, please send the receipt and the photo of the drain tube to our email as follows, we will check and reply to you, thank you.
shopservice@bitspower.com.tw