FTMC0404 1/4'' male pipe thread x 1/4'' tube fitting. The 1/4'' tube pushes into fitting and is locks in. Easy installation. Fits all AIM-series filters. The 1/4'' tube pushes into fitting and is locked in. To remove tubing from fitting simply hold down the collar that will lift when the tube is pulled. This is what locks the tube in. So, hold it down and pull the tube right out.
