WS2H/WS3 PCB RELAY EXP KIT ( newer 2020 ) V4427
Is what would be used with new parts ( boards ) found in upgrage kit V4428
Upgrade requires new Main board V3242-02BOARD, plus new V3082-01 POD assembly, new DC Power Supply ( Tranformer ), and in some cases the new Relay Daughter Board V4427
See these items here: WS2H/WS3 Upgrade Notification 03/27/2020
Note: WE have no programming support available for this Control Board, and Clack will only assist through the original valve dealer who installed the Clack Valve. So, be sure you know how to set up / program this control before ordering from us.