Excellent Condition Zen DP-200 (200mm) Optical Glass Dome Port with Subal Type 3 Mount, however includes a Subal Type-3 to Type-4 Adapter plus 20mm & 50mm Extension Rings to work with the following lenses:
Nikon AF-S DX Nikkor 8-15mm f/3-5-4.5G ED - Subal EXR-20
Nikon AF-S DX Nikkor 10-24mm f/3-5-4.5G ED - Subal EXR-50
Canon EF 17-40mm f/4.0L USM 430504 - Subal EXR-50
Canon EF 8-15mm f/4L Fisheye USM - Subal EXR-20
Canon EF-S 10-22mm f/3.5-4.5 USM - Subal EXR-50
Sigma 17-70mm F2.8-4 DC MACRO OS HSM | C - Subal EXR-50
Tokina AT-X 10-17mm f/3.5-4.5 DX Fish-eye - Subal EXR-18 (20mm works fine)
Alternatively Zen Can switch out the Subal Type 3 Bayonet Mount, however I am not sure of the cost, or Nauticam make an adapter to fit Subal domes to their housings. Selling as don't shoot rectilinear lenses any more (use the WACP) and my 8-15mm works well with the smaller DP-170, though the DP-200 is better for splits!
The Zen DP-200 new costs $1299 (though isn't sold any more), the EXR-20 or EXR-50 new cost $160-180 each and the Subal Type 3-4 Adapter costs $105. Selling all together so will cover both fisheye and rectilinear for Nikon & Canon, plus a free padded case for $850 ono. If you don't need the Type 3-4 Adapter deduct $50. Item located in Thailand but will ship worldwide at buyers expense that isn't too expensive from here.