Review on 🔌 eufy RoboVac Replacement Rolling Brush & Accessory Compatibility Guide: 11S, 11S MAX, 30, 30C, 30C MAX, 15C, 15C MAX, 12, 25C, 35C, G30, G30 Edge, G30 Hybrid by Keegan Hillyer

Not suitable for 11s. The square end component is different, and in general the brush is too long and does not fit. When you insert it, the device just beeps because the brush is too tight to turn. There was a repeat order earlier in the summer when I received the correct brsuh. Asked for a replacement order and they sent the same model which still doesn't fit. Very disappointed, this is not the same model that I received when I first ordered. Note the hollow square end on the new piece (right side in picture) versus the solid square end on the old one. Yes, the old one is worn out, that was the reason for ordering a new one.