code/modules/plumbing/plumbers/reaction_chamber.dm

/obj/machinery/plumbing/reaction_chamber | a reaction chamber for plumbing. pretty much everything can react, but this one keeps the reagents separated and only reacts under your given terms |
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/obj/machinery/plumbing/reaction_chamber/chem | Chemistry version of reaction chamber that allows for acid and base buffers to be used while reacting |