code/modules/plumbing/plumbers/_plumb_machinery.dm 
| /obj/machinery/plumbing | Basic plumbing object. It doesn't really hold anything special, YET. Objects that are plumbing but not a subtype are as of writing liquid pumps and the reagent_dispenser tank Also please note that the plumbing component is toggled on and off by the component using a signal from default_unfasten_wrench, so dont worry about it |
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| /datum/reagents/plumbing | Specialized reagent container for plumbing. Uses the round robin approach of transferring reagents so transfer 5 from 15 water, 15 sugar and 15 plasma becomes 10, 15, 15 instead of 13.3333, 13.3333 13.3333. Good if you hate floating point errors |