Carburetor question

I have a Murray lawn tractor with a B&S motor model #28V707 (1113-E1). It has a Nikki carburetor #694941 that's gravity feed.

Question- does this carburetor have a removable inlet seat? I'm replacing the needle valve and seat but the seat seems to be cast into the carb. Even the parts diagram doesn't show a inlet seat.

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Carburetor question