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inspection opening (IO)

Also called: IO, inspection eye
Standards
an access opening in a pipe or pipe fitting, arranged to facilitate inspection testing or the clearing of obstructions, and fitted with a threaded cap or plug or an access cover
Source - AS/NZS 3500.0:2003: Plumbing and drainage
HB50
small access opening in a pipe or pipe fitting to facilitate inspection, testing, or the clearing of obstructions; generally fitted with a removable access cover, plug or threaded cap
See Figure A.69

Figure A.69: Drainage pipes and fittings (I)