There was a previous thread on this subject. I have(had) the same problem on my shower but the dealer replacement has held up so far. It no better than the original so I'm sure it will fail also. On my shower the seal at the top is the same as on the bottom so in a pinch I just trade them out to buy some time. Anyway, i haven't had to follow up on this recommendation but someone Home Depot had a suitable replacement that might be of better quality. From the website it is identified as"Frost King Model # DS101WH Internet # 100137062 Store SKU # 626228 E/O 1-1/2 in. x 36 in. White Self-Stick Door Sweep". If you try it let us know how it works.
2015 Jayco 27DSRL
2016 Little Guy CIRRUS 800 Truck Camper
2015 GMC SLT 3500 Duramax Crew Cab, SRW