This is a Kort Nozzle with integrated mount for a homemade ROV thruster made from a Mayfair 750 GPH Bilge Pump.
Adding this kort nozzle to the thruster will increase the output thrust by about a full pound.
This nozzle was specifically design to work with a 3 blade 50mm Robbe Boat propeller using an adapter with these specs.
This version of my kort nozzle incorporates the thruster mount right into the kort nozzle design. It mounts to the Rov frame using 6/32" hardware and the thruster pump locks into the mount with a 1/4 turn. (remove o-ring from pump first.)
This is part of a homebuilt Rov I've been working on (seen here) for the last few years. I haven't finished it yet but thought I'd share anyway.
For a MATE Compatible version of this see https://www.thingiverse.com/thing:2854024
STL prints as positioned with minimal supports. Even printed at 100% this will probably not be waterproof so keep that in mind when it comes to your Rov's buoyancy.
Basic Assembly (must be mounted to frame before installing pump thruster.)
Mounts to frame with 6/32 Hardware.
The area around the nozzle must remain open for proper flow. (example shown above)