i have 2 fastflow valve stem assemblies comprising of valve stem, adjustable tophat, valve spring, delrin tip. all you need is your valve body as in these kits is all you need to fastflow your valve. 1 kit is the loupy kit and the other is unknown but definatly fastflow. in buying its your responsibility to make sure gun is shooting to uk legal power after fitting. (£35 each posted). first to say yes followed by pm gets them. also have a leupy hammer & spring £35 posted.