Brand new and never used YS TTL converter Mfr# ss-50117 (for Nikon).
The converter is compatible with all current Sea & Sea YS strobes including the YS-250Pro and other strobes. The converter allows quick switching underwater between TTL mode and manual mode from outside the camera.
Price for new is US ~$650, I'd like to get $500, price includes shipping fee.
Photos upon request.
Thanks,
Robert