Step 4Install Brass Fittings on Plastic Tubing
Separate the components of the brass adapter. Slide the compression nut onto one end of the tubing, slide on a plastic or nylon bushing, and then insert the tubing into the the body of the coupling. Once the parts are positioned on the tubing in this order, you can tighten the nut onto the coupling. It's not necessary to make this an incredibly tight connection--it doesn't need to be water-tight, it just needs to be tight enough to keep the adapter from falling off accidentally. I recommend using plastic or nylon bushings instead of brass bushings as the brass may cut your tubing if you tighten it too much. Repeat this step for the other end of the tubing.
In the picture, the plastic bushing is turned the wrong way, but since it isn't necessary to create a water-tight seal here, it's no big deal.
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