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All the parts you will need to Repair an RP/DC-501 or an RP/DC-500 Assembly are listed below. With the modular design these backflows do not require much in order to service or repair any device. The three main Components you need to service an A.R.I. Backflow are the #1 Check Valve, #2 Check Valve and the Relief Assembly, it should take less than 5-6 mins to properly service any model and size.

Take your time, double check everything, enjoy the ease of use and Good Luck Out There!
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