well... cause pumps for watercooling a pc need to run relably 24/7 for years... pretty much the pumps that fit this specification are aquarium pumps... which would all be connected to mains and so ac. only problem with this is that aquarium pumps never get turned off... however some ppl might want to turn off their pc pumps.. so that can be a slight problem.. but oh well
dc pumps are normally bilge pumps. These arent built to run 24/7 but instead short bursts, so when you make them run 24/7 their is a fair chance they will crap out after a month or 2
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