The MacClean valves and tank are proprietary in design after 2001 ( bought out by CUNO, which in turn was bought out by 3M ).
See:http://www.aquapure.com/

Prior years used either Fleck 5600 ( RS, NS, NLS or NSM models ) or Fleck 2500 ( CSM models )type valves, and most parts under the Fleck repair parts category should match up.
Check part numbers, and email us with PHOTOS, if you are not SURE about your MacClean Valve and parts identification.

Here are photos of the newer Proprietary version MacClean that we can NOT provide any parts for....
Note the "collar" used to "clamp on" to proprietary Tank ( which we also can not provide ).

Above is the newer Uniflex Tank ( no threads ) that is proprietary.

Below are an old MacClean ( such as the CS1001 and CEC1000 series ) that uses the same Pistons and Seals as the Fleck 2500

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QUESTION:
The picture of the Seal Kit in the Fleck parts list shows a short spacer (part # 10757) as part of the Seals and Spacer Kit (part # 60121), however the Spacer in the MacClean Control valve is approx 1.5” long – any comments?
** Correct.. You must "re-use" their larger spacer and not the small white end spacer that comes in the 60121 kit.
That is why they call their Kit 60121-C ( proprietary version with that special wider spacer made for MacClean valves ).
We can only provide 60121, but it will give you new seals and some new spacer to complete repair of your MacClean.

And this is a partial list of models that can use the 60090 piston ( F ) and the 60121 Seal Kit ( E, minus end spacer ) we offer ( noting we don't have the large extra spacer in our kits ).
O-ring # 28 = 11710 = Inside Distributor
O-ring # 29 = 11208 = Seal between the Valve and Adapter
O-ring # 31 ( not shown ) = 10381 = Bottom to Tank

Cross Reference ( but not limited to these models in the CEC 1000 Series ),
CSM1000, CSM 1001,1500, 1501
MCA0750, MCA 0751, 0750M, 0751M
MCA1000, MCA 1001, 1000M, 1001M
MCA1500, MCA 1501, 1500M, 1501M
MCA2000, MCA 2001, 2000M, 2001M
MCA 3001,MCA 3001M
APIR075S, 075M, 100S, 100M, 200S, 200M

And Backwash Only ( no brine valve - no injector housing on Valve ),
such as CEC 1000 - CBW1001 Series

And this next photo shows an older electronic version that used standard threaded tanks.
So, in this case, the valve could easily be Replaced with Fleck 5600



Reference Only,
IS 100 Mac CLEAN ( = Fleck 6600 model ) installation video on YouTube, http://youtu.be/ckByPaiusEg