Provides a physical barrier to the passage of particles to pump and reverse osmosis membrane. Fits Models:CN200RDM1-115 , CN200SDM1-115 , CNHFRR2M1-230 , CNHFRS2M1-230 , CNHFVR2M1-230 , CNHFVS2M1-230 , CNVSXR2M1-230 , MR200DSM1-115