The seal is flexible on the Reef Diaper but the flange assembly is rigid. I don't know if it will slide past the protrusions on the sock holders. I will work on getting an answer for you. Has any other member used the Reef Diaper with a Triton sump?
Thanks everyone. I'll give them a try and report back.If it helps, I have the Triton 34 and I've been using the diapers for a couple of months. Initially I didn't think they would fit with the pipe extended but I found that there is a bit of a trick where you can slide the diaper flange up the pipe at an angle then rotate it and eventually it hits a skinnier spot on the flange that lets it get up over the holder in the sump, then it seats very nice and snug in the holder. To get it out, just reverse the process - lift it at an angle and rotate it until it drops down past the holder and slide it off the pipe. It's not super intuitive, but once you figure it out, it works just fine - no force required to slip it past if you rotate it until you find the sweet spot where it fits.