Will this brand work with no leaks? Honestly I didn't even give it a chance by itself, but the inside thread is perfect for what I had in mind:
While I was waiting for this to arrive in the mail, I went to a local hardware store and for about $1, I bought a small pack of flat, rubber, garden-hose washers and put one in each end of this coupler. Then, I removed the white plastic rings from the neck of both 2-litter bottles (the ring that's left over from the cap), I added the liquids, and screwed both bottles in.
The result was perfect, even when the liquids were carbonated. The rim of each bottle screwed into the rubber washers, making a perfect seal, and the rim of the coupler lined up perfectly with the collar of each 2-litter bottle.
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We first tried LOTS and LOTS of duct tape and plastic and metal washers but after numerous attempts they just did not hold up well after many tries. The duct tape would not hold up well on the drive to school so we opted to buy this inexpensive yet amazingly working product. Just add 1 drop of blue food coloring as we tried reds, orange and others yet the blue worked best as we saw more of the vortex action with just 1 drop of blue, mix it and u will see its plently. My 4 yrd olf son asked in a few years of he could use this same device when its time for him to do the same in school.



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