The MJEP series is manufactured by Matjack, and is a underwater pillow bag that is completely enclosed with over-pressure valves to vent expanding air as they ascend. It is excellent for raising sunken boats, and for towing jobs.
The pillow bag comes with brass quick-disconnect fillings equipped to a short filter hose with 1/4" pipe thread. The unit has a lifting capacity of 250 lb to 6000 lb, and shipping weight of 5 lb to 53 lb.