Aqua Ultraviolet UV Sterilizer "New Style" Mounting Clip with Grip Hold Part # A40124
 
Inside diameter of the mounting clip in closed positions
Closed in First position is 2-3/4 inches
Closed in Second position is 2-1/2 inches
These are Sold Singly (one per package)
 
These are the New Style clips  ** See part # A40020 for the OLD Style without the Grip Hold C Clip.