5 stars for the spunding valve component but 1 star for the gas connect which did not work with the 8 mm rigid joiners at all even under a low amount of pressure.

Easy and useful. I ferment in a keg and slap this in after peak fermentation is winding down. Gives a head start on carbonation. Also use on a second keg if transferring carbonated beer to prevent foamng.

I added the Flow Stopper assembly to this since I intend on using it primarily as a keg to keg or fermenter to keg transfer system.

Bought several others from other places that were cheaper and had nothing but problems. I wish I would have just bought this one first. Works exactly as it's supposed to.