Bought these for a couple of rain barrels. They seem pretty decent and sturdy. These being metal, I'd be more concerned with damaging the vessel it gets installed in (cracking the plastic, for example) than a plastic version. They do have 1/2" female NPT on the inside of the fittings and the outside 3/4" male GHT fit a spigot mounted shutoff valve perfectly. The one thing I will disagree with the description is the statement that you'll need to drill a 1-1/16" or 1-1/8" hole... I couldn't find a 1-1/16" bit in my local stores, only 1-1/8", which I feel is a little too big. I tightened one fitting with a1-1/8" hole and the gasket was able to partially enter the hole. I recommend using a 1" paddle bit and just wallowing it around a bit to open the hole up just enough to get the threads in.The tricky part can be installing these in the bottom of a barrel if you have limited access (if you don't want to cut off the entire top of the barrel, for example). I saw a youtube video where a guy used a string with a weight to feed the fitting into the barrel from the inside, then tighten the nut on the outside. Holding pressure on the fitting inside the barrel is a challenge, but I found a solution using a 1/2" male NPT x Barb fitting intended for flex pipe for irrigation systems. Keep reading for my process.***See photos as you read my instructions below***Before trying to put the fitting into your barrel, insert the barb into the fitting from the inside end of the fitting, then tighten the threads into the female threads on the inboard end of the fitting. As you tighten the nut on the outside of the barrel, the fitting on the inside will tighten, but since it's plastic, it shouldn't allow you to overtighten to the point of damaging the barrel. I also recommend putting a 1/4 hex nut inside the plastic fitting before running your string through. Turn your barrel upside down to that your drilled hole is above your access point, and drop your weighted line through the hole and into the barrel, fish it out the access point. Then you run the string through the fitting and slide it down the line, into the hole. Once you pull it through the hole and have a good grip on it, pull out the string and start the outer nut to keep it from falling into the barrel. Now you can insert a 1/4 bolt through the barb fitting to give something to hold onto while you tighten the outer nut, as well as helping to prevent crushing the barb fitting if you get aggressive with pliers during the process.Once you've got the fitting installed and tightened down, use pliers to turn the barb fitting clockwise (normally this would tighten it, but since it's on the inside threads, you will be loosening it). Flip the barrel over to remove the barb/1/2" fitting and you should be good to go.