Thanner Disposable Hydrostatic Release Units are all patented units, designed for trouble free installation, reliable function and service free lifetimes of 4 years /48 months or 2 1/2 years /30 months after correct installation. The units are all approved to the new MED and SOLAS regulations together with ships wheel approval, USCG, TC and many others. The units are made from stainless steel and UV- resistant plastics to meet the tough requirements of the marine environment. The units operate independently of the life raft buoyancy and is approved for all sizes of life raft! up to a buoyancy load of 1500kgs. All parts can be recycled and are made from non-toxic materials. Special versions/other release depths are available on request.