A change is being made to the shaft guide seal used in AquaMatic K521 Series valves. The current quad ring is being replaced by a standard O-ring. All three material type options (EPDM, Butyl, and Viton®) will be affected by this change.

The change is being made to improve seal quality and durability. This change will take place in the coming months, depending upon current part and order quantities. The following parts are affected by this change:

Old Part Number Description New Part Number Description
1071942 QUAD RING, 2-029, EPDM 1081945 O-RING,EP,ORE-029
1071943 QUAD RING,BUTYL,2-029 43893 O-RING, 2-029, BUTYL
1071944 QUAD RING,VITON 1081947 O-RING, -029, FKM

Please see the illustration below for the location of the shaft guide seal affected by this change.

As always, thank you for using Pentair products.

Best Regards,

Jeremy Josetti
Technical Services Manager