Hey, weezard! Glad to hear from you again, buddy. I don't have a scale where I'm at (my house), but I estimate the rig dry is about 3.3lbs.

I was thinking the same thing on the small pipe. balloon, plug or vertical outlet. The vertical outlet I put on hold as the pressure, while not high, might still push water out the pipe, right...? I have a lot of plastic tubing to go on the pipe, though. I don't know exactly know how that would work with no air-intake and all... Might be a possibility. Now, that I'm thinking about it a balloon might be the thing. It might inflate a little, but it should stay small, right? Hm, hard to imagine how this works... With a finite amount of matter inside a closed space... The vertical outlet idea should work like when you put a straw into the coke bottle and pull it out with your finger on the air-end, though... but, maybe the pressure pushes the water out and lets air in and starts a siphoning-cycle, emptying the whole thing... I have no idea. What do you mean by "meat-thermometer" btw? didn't see that part before writing this paragraph.

Initially, I thought you meant the temp-switch would be a safety device, shutting down the whole thing if it had to... It's normally open, btw. But I would rather have it work like you described in your last post. Like you said, I assume the copper would be able to dissipate enough heat to work passively for some time (if that's what you meant). I should have ordered double and used both functions! I have been dreading the constant humming from the fan and pump, but your idea for the heat-switch would take care of that.

Water doesn't expand a lot before boiling point, if I got it right, so ~50 celsius is no problem, pressure-wise.

EDIT: I need more air in my posts
LedElk Reviewed by LedElk on . LED-WATER-HEATSINK Hello! I am a noob DIY-LED-GUY, in need of assistance. Now, I'm about to fire up an LED-DIY grow and since this is my first time ever making an LED-LAMP I've decided to jump straight into the deep end of the pool and do a water-cooled rig. As pipes are mostly round there was an issue with lack of flat space to mount the LEDs on and the right parts was hard to find, so it kind of just ended up like it is. My question is: will it work? I have an aquarium pump that goes between the Rating: 5