Pre-order only. 
The waterproof case Sea Frogs SFA-A7RIV for Sony A7RIV. It allows your camera shooting underwater down to 100 meters (325 feet) to discover the world of the underwater. With this special design case, every main key of the Sony can be pressed to control freely as you want. Ready to mount vacuum leak check circuitry and valve, use the included pump to secure your housings against leaks before your dive.
Comes with Dome port for Sony 16-35mm f/2.8 & Macro port for Sony FE 90mm macro. Also includes Vacuum System.