Nauticam S6 bulkhead for Nikon D810?

I want for my Nauticam D800 Nikon housing a bulkhead with S6 connector....I only see items for canon hotshoe, why not for Nikon?

This has historically happened .... Photographers believe that Canon has 6-wire TTL protocol, Nikon has 5-wire TTL protocol. That is why 6 pin bulkheads are often were named for Canon usage.

But this is a mistake. Canon also has 5-wire TTL protocol. The Canon's additional 1 wire is Autofocus Lighting Assist (On/Off LED torch on the land flash), it does not refer to TTL protocol. In underwater configurations we don't use that additional wire at all.

So, underwater photographers can use Canon TTL by 5-pin Nikonos bulkheads as well.

You have to connect Nauticam S6 bulkhead to standard Nauticam Nikon HotShoe plug (plug is included with D800 standard package). This way you can use 1 pc your Seaflash strobe in TTL, directly connecting it to the camera. If you want to use 2 pcs Seaflash strobes in TTL, you need special electronics module between them (inside the housing).