I am currently building a RO and have read multiple threads on Maple Trader regarding membranes. I am leaning towards using a Dow FilmTech XLE 4040. After doing a Google search for a FilmTech XLE-4040, I found the following listed for it:

XLE - 4040 Part Number 154546
LP-4040 Part Number 212819
TW30-4040 80610

Which one are most of you using. I assume it is the 154546 but mostly 80610 popped up on the search.