Your search for "Fleck 2510 Service Kits" revealed the following:

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Parts & Accessories
Connector Assembly, 1-1/2" MNPT Noryl w/O-Ring (2-Pack) - 42241-01
$14.00
Connector Assembly, 1-1/2" MNPT Noryl w/O-Ring (2-Pack)
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Availability: In Stock
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Parts & Accessories
Connector Assembly, 1-1/4" MNPT Noryl w/O-Ring (2-Pack) - 40565-01
$13.50
Connector Assembly, 1-1/4" MNPT Noryl w/O-Ring (2-Pack)
ADD TO CART
Availability: In Stock
Brine Valve Assy, 1700, 2.0 GPM, 2750/2850/2900

Brine Valve Assembly, 1700, 2.0 GPM, 2750/2850/2900

Quad Ring -118, TwinFlo 8500 - 18874

Quad Ring -118, TwinFlo 8500

Quad Ring -121, TwinFlo 8500 - 18875

Quad Ring -121, TwinFlo 8500