Question about plumbing

Just from a quick look, are the couplings on the I side or the outside of the bulkhead?

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If I'm right then the coupling is not supposed to screw onto the bulkhead, the PVC fittings are supposed to go inside the bulkhead sometime it's a slip fitting and sometimes it's threaded.


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Like so

afbc0d827142eb1faef21e793ceaced0.jpg


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