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[Chandrak]

I want to build a system to drop magma into rooms below. I know liquid doesnt move diagonal across z-levels, but can I build a floodgate over an empty space? Basically, I wanted to have a 3-wide corridor of magma - can I put holes every few center tiles and cover them with floodgates?

[BigJake]

What's wrong with hatch covers? Possibly, I don't understand what you're doing.

[Chandrak]

Can hatch covers be opened by lever?

As to what I'm trying to do.. I'm an Evil Dictator who will sacrifice brokers to the magma gods in thier own rooms if they wont get off thier rears and go to the Trade Depot instead of sleeping

Essentially, I've got a 3x3 tunnel like so:
__________
__________
__________

I want to know if I can did channels in the 'o' spaces (revealing the room below) and build a level-operated floodgate in the 'o' space, without magma leaking through when the floodgates are 'up':
__________
_o__o__o__
__________

[BigJake]

Yea, it's hatch covers you want.  They can be operated by a lever just like a floodgate.

Also, though this has nothing to do with your plan, if they aren't hooked to a lever they act just like doors. (Only rotated 90deg, obviously.)

edit:  Thank you, bcd1024.  That slipped my mind.  Magma-safe stones and metals.

[bcd1024]

Please make sure the hatch covers and mechanisms are magma safe.

[Chandrak]

Yeah, I knew they had to be magma safe or they melt after awhile. I wasnt aware hatch covers could be attached to levers; the wiki didnt say. Thanks, that answer the question, then.