How parts list revisions change which part fits
Does it matter which revision of a parts list I am reading?
Yes. Manufacturers republish parts lists by revision, and components are added and removed between them. A part number can appear on one revision of a model’s list and be gone from the next, so an older document can point you confidently at a part the manufacturer no longer lists for your appliance. Always check the revision on the document you are reading.
What a revision actually changes
A revision is not a cosmetic reprint. Components get added, removed, renumbered and reassigned between models. The document usually says as much in its own front matter, warning that earlier configurations may differ.
That makes "which revision" a real question rather than bibliographic detail, and it is why every part page on this site names the revision it read.
A real case from our own data
This is not hypothetical. It is why the rule below exists.
Thetford 31708, blade seal
- Aqua-Magic Residence parts list, Rev C — 31708 is listed
- Aqua-Magic Residence parts list, Rev D — 31708 is gone
- Aqua-Magic V and VI, Rev E — 31708 is current
Why we do not merge revisions
The tempting shortcut is to pool every revision we hold and say a part fits everything that ever listed it. That produces a longer, more impressive-looking answer and a false one — it would have this site telling you 31708 fits a Residence, which the current document does not support.
So fitment is resolved against the newest revision we hold for each model, and nothing else. Where an earlier revision listed a part the current one does not, we say that explicitly and treat it as a lifecycle note rather than a fit.
What this means when you are reading a diagram
An old PDF found through a search engine, a manual that came with a used camper, or a diagram reposted on a forum can all be several revisions behind. None of them are wrong documents — they were correct when published — but they describe a configuration that may no longer be current.
Check the revision, and prefer the newest one you can find from the manufacturer.
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Last checked 2026-08-30.