Brass Compression Fitting For Plastic, Copper, & Aluminum Tubing, 0.19 Inch Tube OD Union

Aluminum tubing with a 3/16 inch outer diameter is exactly what this fitting is built for. It also handles plastic and copper at that same OD, so if you ever swap materials down the road you won't need a different union. Just make sure you follow the assembly instructions for your specific tubing type, and if you're running plastic, you'll need an Eaton PT230 insert unless the plastic type is one of the noted exceptions.

This fitting is designed for use with plastic, copper, and aluminum tubing. When using it with plastic tubing, make sure you check the pressure and temperature ratings for the specific plastic you're using. Also, you'll likely need an Eaton PT230 insert, unless you're using a type of plastic tubing that doesn't require one.