is the large 3" Piston Assembly ( coated ) for Clack WS3 commercial valve.
Connects to metal shaft of Drive Assembly ( V3093 ) sold separately.
*** SPECIAL ORDER - 2 to 3 week Lead time before item ships ***
* NOTE: V3666 version = UNCOATED, and should never be used.
And that is why you'll not find that part number on our website.
If you need a PISTON for the WS3,
you should order this part ( V3666-01 ).