For sale is the Aquatica extension ring 18463. Item is in almost new condition.
This extension ring adds 21.5mm or 0.82” to your port (see Aquatica port chart to check your lens here: http://www.aquatica....cts_zoom.html).
Asking $150 including shipping within the U.S. (USPS Priority). International shipping please contact me for shipping quote. Paypal accepted. Contact me with any questions.