Nemo Power Tools 18V 4 Prong Battery Charger (SP94101) filterparts It is a practical service It is a practical service part when dependable one way flow control is important to maintaining the intended behavior of a compatible water treatment or plumbing setup A pre filter like this is especially appealing at fill or refill time because it helps improve the quality of the water before it enters the system The Nemo Power Tools battery charger is designed for compatible battery powered tool applications where the battery needs dependable recharging support This replacement is especially useful when the original charger has failed