I've been looking for a replacement ballast for my Master Water Conditioning MWC 7 UV system for a long time. The ballast is from the MWC 350. I bought this one and it works perfectly. The only difference is that this works with 4 pin and not 2 pin. Well, at least I haven't tried a 2-prong lightbulb. But it works great and fits the device perfectly.
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