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I have worked on a lot of "PD" pumps the first one would from a mechanics stand point is the way to go for the product seals it uses a o - ring a lot cheaper and easier to put in. The second one looks to have a double seal one side is a flush seal and a carbon seal inside. Seals can be very expensive and very easily damaged. Other than that they are both good pumps they can take alot of abuse.
 
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