As to the first sentence, I don't understand what "ducks" mean here(what are ducks doing in a boiler room?), nor do I understand the whole sentence.
1. Look here. You open an close theses ducks by pulling these rings. (The coworker Watson is showing the protagonist how to operate a boiler correctly)
2. Then Watson gave the pressure wheel a spin and dumped the boiler off.
3. Now you got to remember to come down here twice a day and once at night before you rack in.
Hi I think 'ducks' is being used there as a phonetic spelling for 'ducts'. Those would be the pipes that lead in or out of the boiler Over a period of time, a boiler will fill up with dirty and rusty water. In order to keep the boiler working well, you need to get rid of that by letting it all flow out.
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