Your search for "fleck 2510 service kits" revealed the following:

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Parts & Accessories
Drive Housing Assy, 5600SXT - 14448-100
$56.00
5600SXT Drive Housing Assembly
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Availability: Out of Stock
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Parts & Accessories
Bypass Assembly, w/Clips, 7000 Series - 40569-01
$100.00
Bypass Assembly, w/Clips, 7000 Series
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Availability: Out of Stock
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Parts & Accessories
Piston Assembly, 7000 Series, STANDARD SOFTENER, 0-28GPM - 61453-10
$70.00
Use this piston for all 7000SE and 7000SXT valves in "Softener" or "Regenerating Filter" STANDARD configuration.
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Availability: Out of Stock
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Parts & Accessories
Transformer, 24V US, 7000 Series (now 44148) - 40981
$59.00
Replaces existing 40981 transformer on all 7000 SE and 7000 SXT valves. New Part Number is 44148.
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Availability: Out of Stock
Fleck 7000 Powerhead, SXT Meter
Fleck 7000 powerhead with SXT timer set up for meter / single backwash / brine fill last / softener operation with meter cable, transformer, and...