for Clack WS1 Valve and other "brands" that use the Clack type of valve under their private label.
Made to allow "mounting", but no screws come with this product.New = Clack started sending valves with a 15 volt DC transformer after 2017.
NOTE: DC transformer ONLY works with newer Valves / newer Control Boards ( since 2017 ).
HOWEVER... the AC 12 volt transformer ( V3186 ) will operate both Old and New style control boards.
HISTORY of AC and DC operated boards and their Transformers:
All Clack control boards made before 2014 will only work with this AC transformer.
And the 3 button TC boards made before 2017 will only work with this AC transformer.
All boards made AFTER 2017 ( and some 5 button boards made after 2014 ) will work with either the older AC transformer,