Super Reef octopus External Question

[Millepora_Maniac]

HI All, IN the diagram located here:

http://cdn.bulkreefsupply.com/media/wysiwyg/PDFs/Octopus%20XP3000Ext-instruction.pdf

I am wondering what the little valve is located at T on the diagram. It says automatic drainage system. There is nothing to describe it in the instruction manual, what is it's purpose? I have run this skimmer for a while and wondered what I could use it for.

Thanks for the help!

[Bugger]

Its there to drain it so you can lift it

[Millepora_Maniac]

That's all it's for? LOL

it automatically drains for me since the pump is hooked up down stream. if I shut it down it drains.

I thought this could serve some other purpose.

Cheers!