Sea Doo Aqua Master underwater propulsion unit for sale. Used, but in good working condition. This propulsion unit was intended for the Sea Doo Aqua Master ZS40/SD75004 motorized inflatable raft (see picture #4). However, I couldn’t help noticing that it looked very similar to the Sea Doo Sea-Scooter (see picture #5). It was my intent to modify the propulsion unit into a sea-scooter (please see pictures #6 & 7 for examples), but lost interest in the project. Everything is included as seen in pictures # 2 & 3. With a new 12v battery (see picture #8), the propulsion unit can be used with another Aqua Master inflatable raft or possibly retrofitted into a sea-scooter.