The only reason I didn't give this 5 stars is that it should come with a recommendation for how long a piece of tubing to attach. I suggest a 12" long piece of tubing.

Maybe my faucet is an odd duck, but every time I use this with serving pressure higher than 4 psi it leaks like a sieve (on the order of 1/2 pint per growler). It will preserve foam and CO2 unlike from the faucet straight, but its not a night and day difference. Not sure what I expected from a $4.50 piece, but if you fill growlers as much I do just get a counter-pressure filler like I am.

Works well. I thought I was being careful, but twice I managed to shave of a piece of one of the gaskets while inserting it into the tap. No leaks, yet, but when the gaskets do go, the whole thing will go. At this price, I'll try another.

Works better than putting a hose in or over the faucet.

If you want to make a quality beer, use quality ingredients. I use this for making Belgian dubbels, and they have always turned out great.

Nice and clean when filling a growler or two. Slides in to the faucet. Previous use of tubing on the outside of the faucet always was a mess.

It fit perfect on my kegerator faucet and fills growlers with minimum foam. One thing I would recommend using with it is keg lube. Allows for an effortless installation and removal from tap.

After receiving this, I hooked it up to some 3/8" tubing, and was getting more foam than I wanted. So, got a piece of 5/16" tubing, warmed it in water and hooked it up to the filler. It works much better now and I get very little foam when filling a growler.

Fits my standard taps great, better fill results compared to using tubing only, wish the machining quality was a little better. First piece ordered has really rough area inside. Replacement piece had rough area inside as well. Not a big deal since these are just for growler fills. Would like to see these machined smooth on the inside as well.