Pantene pump shampoo coupler ring
thingiverse
Coupler ring connects two Pantene pump-style bottles together so one can drain into the other. I discovered another [shampoo ring](https://www.thingiverse.com/thing:2185329) on here, but even if scaled up, it didn't work with these bottles, so I designed this one from scratch. It was inspired by the other model. Update (Jan 17, 2018): The first ring I made broke when being tightened down on the next bottle pair we joined up. The walls were a bit thin, so I increased the outer diameter by 1 mm, hopefully making it strong enough for more uses. I didn't update the picture because the 1mm difference between them won't be noticeable in the images.
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