This Ball Lock Liquid Fitting comes with a 1/4" barb already attached to it so all you have to do is hook up your tubing and you are ready to go. This fitting will work with 3/16" tubing as well, but you need to soak the tubing in hot water for 20 seconds to soften it up first.
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Just used this for the first time on a new keg of homebrew and it attaches easily and there is no leaking. Will buy more.
These are good quality liquid connects. The Poppets are plastic with a standard oring that is replaceable. The Barb is a true 1/4 so 3/16 will fit if the hose is pliable enough and 1/4 is a no brainier. I Do not believe 5/16 will work reliably even with hose clamps. The Barb appears to be stainless as i haven't noticed any loss in the surface condition. If clearance is really tight you can keep the profile of hose lower with these compared to the Threaded version.
Haven't had any issues yet. Easy to slip on tubing after it soaks in hot water for a bit.
Been kegging for about 2 years now and the only reason I have to buy them is when adding an additional keg. Mine have been banged around pretty good and still have a leak proof seal. Make sure you unscrew the tops and clean out the spring and seal between brews!