Quick Connect Tubing Insertion
How the common Water Filter systems connection 1/4" and 3/8" fittings are to be used, and how the Quick Connect fittings operate. IF the Fitting LEAKS, then you don't have it pushed in ALL THE WAY through the o-ring.
When installed correctly, the fitting will Not Leak, and you can NOT pull the tubing out ( without dis-engaging the locking ring / collar ).
Below show the tubing only 1/2 the way installed... you will feel "resistance" as the collar starts opening / grabbing the tubing, but it's not going to SEAL unless you push in further ... Past / Through the O-ring. ALL THE WAY into the fitting.. past the o-ring ( the critical seal that prevents leaking ).
More on the subject can be found here: https://www.softenerparts.com/kb_resu...