Qingdao Doowin Rubber and Plastic Co., Ltd. is a leading professional manufacturer of underwater lift bags, marine salvage bags, water-filled water weight bags, pipeline buoyancy bags, lifeboat and davit load test water weights, water and fuel bladder tanks, and other inflatable buoyancy units.

DOOWIN underwater lift bags include parachute type underwater air lift bags and totally enclosed type air lifting bags. The parachute type air lift bags have the open bottom type and enclosed type. The sealed type air lifting bags include cylindrical shape enclosed air lift bags, pillow type flotation bags, elongated float bags salvage tube, individual buoyancy bags, mono buoyancy units, and twin boom pipe floats. These underwater lift bags can be used for marine salvage, pipeline laying work, diving work, buoyancy support. The buoyancy capacity of our air lift bags is from 50kg to 50ton.

Our water filled proof bags include crane test water weight bags, low headroom load test water bags, deck load test water weights, lifeboat load test water bags, davit load test weights, and gangway water bags test weights. The crane load water weight bags capacity is from 1ton to 100ton. The lifeboat load testing water bags have 100kg, 375kg, 400kg, and 600kg. The water weights water filled weight bags are used for the proof load testing instead of the traditional solid crane load test weights. All proof load test water weight bags are supplied with its accessories, ready for use. The crane load test load cell dynamometer will be supplied upon request.

DOOWIN liquid bladder tanks include pillow type potable water tank, bulk water storage bladder tanks, fuel bladder, rainwater tanks, agricultural water tank, gray water pillow tanks, water storage bladder tanks, drinking water bladder tanks, flexitanks, conservator bladders and other special design flexible tank bladders.

We also make the lower pressure inflatable boat fenders used for the small boats and yachts. Marker buoys used for the sailing racing. DOOWIN inflatable pipe plugs are flow stoppers for temporary close off or seal an opening. Our inflatable pipe plug/stoppers are very suitable for use in pipeline, ducts, and tunnels with construction, inspection, repairs, cleaning, and repair.

With a wide range, good quality, reasonable prices, and stylish designs, our products are extensively used for marine salvage, and the proof load testing of cranes, davits, lifeboats, hoist, ramps & lifts, passenger gangways, platforms, and bridges. With a good reputation of quality, DOOWIN is considered as the first choice of many key industry suppliers, contractors, and end-users.

DOOWIN commits to high-quality products with well-equipped testing equipment and strong technical force. DOOWIN′s products passed rigorous ISO9001: 2008 Quality Management System. All underwater air lift bags are manufactured in line with IMCA D016 Rev3 Standard. All of our products are BV, SGS, and CCS certified.

We welcome new and old customers from all walks of life to contact us for future business relationships and achieving mutual success!