You have FA chance of that sealing,speedy sleeve or replace. Pat
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Really makes sense to change them if you can.
Looking at the photo I agree with the others that they are the removable type.
By asking your question, you've answered it yourself. Ol' mate Murphy has seen your post. By his rules; if you don't replace it, you'll be back in there next week..... or by the looks of it - tomorrow arvo.
Cheers guys