Jaeger Precision shows how to install the Lees Precision Engineering CNC Machined Power Down Valve Set For KSC/KWA GBBs. The power down valve set is designed to reduce the power output of KSC S7 and KWA NS2 gas blow back pistols for use in CQB and other sites with limited power restrictions. It features a one-piece design with adjustable settings to accommodate different gases, temperatures, and site fps limits.