The newer ones have different names as well. No more XP2 , 3 , 4
Its now M, L, XL if I recall correctly. Still a great filter for the price that is still worth getting imo. I'm actually replacing a nice eheim filter with the Rena I am so impressed with these filters. Great power, very easy to clean and prime and very well made. The inlet outlet was just ok in my opinion, but it was still nice to have. I'm pairing mine up with some spare eheim "install sets" that I have from older setup. They should match up nicely.