Step 3: The Rubber Hose

The purpose of the rubber hose is to connect the glass bottle to the plastic bottle(while the glass bottle is in the plastic bottle)
The hose I used fit perfectly in the plastic bottle, but had the same diameter as the opening of the glass bottle.
The small plastic tube takes care of this problem, though. I made it by cutting the end off a small test tube.
Cut off a piece of the rubber hose.
To attach the hose put caulk inside the it and push the plastic tube in(it shouldn't be a tight fit, because that would crack the tube, but it definitely shouldn't be loose)
Then put caulk on the rim of the rubber hose around the plastic tube and push it onto the glass bottle. Wipe off the excess and let it dry.
Wrap electrical tape around it.
This is so legit! I'm trying to find <a href="http://www.needaplumbercanada.ca/en/hot_water_tanks__calgary.html" rel="nofollow">water heaters in Calgary</a> that are like this. I had no idea I can make one on my own. Thanks for sharing this!
how can those 2 liter bottles hold any vacuum at all.
Even though they're just plastic bottles they do have some amount of strength...
Well, I mean, When I go suck the air out of my 2liter bottle I have sitting here it just collapses, do you even need a vacuum pump for this.
no...(well, depends on what you mean) I used one of those wine sealer things.<br>If you want a stronger vacuum I would suggest putting some cardboard rings inside the bottles, they'll add strength without cutting down much on the light intake.<br>Honestly the vacuum idea is a good concept but I didn't really give the actual build enough attention.
I know the vacuum is a great benefit to solar heaters and this cardboard Idea is good.
very cool idea i have been planning a big thing like this On my front Garden wioth pumps for Mopcving water and i like the reflector idea

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Bio: An electrical engineer who likes to make things.
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