Things I liked:I bought this for my older air arms s410c. It fit the fill plug perfectly and now I have a quick disconnect for my air arms. It was always a pain before to get out the wrench and take off my quick disconnect to attach the fill plug. This was a very inexpensive way to solve the problem. Things I would have changed:Nothing What others should know:Get this product, leave your tools at home, enjoy easy filling and shooting again.
Things I liked:This fill valve kit is very easy to install and fits perfectly in my air arms s410c. Things I would have changed:Nothing What others should know:If you ever break off the end piece to your fill valve, this replacement works perfectly as a replacement.