I bought it for my refrigerator RS21FGRS. The price was half of the original despite being the same filter internally, and that's why I preferred it. As soon as I screwed it into the slot and tightened it, I closed the refrigerator feeling satisfied. After an hour, I noticed water leakage inside the refrigerator shelves under the filter. I removed it and repositioned it, but water droplets still came out from the connection. Visually, there was no breakage in the filter, and after many attempts, I realized that it didn't fit perfectly in my refrigerator slot, even though my refrigerator model was supported by this specific product! Since I happen to have amateur experience with plumbing, I used plenty of Teflon sealing tape and managed to finally stop the leakage. I will wait for it to expire to purchase the authentic one, even if it's more expensive, as I have done in the past. Do not choose it if you don't have experience with hydraulic sealing.