The Backplate, a plate, commonly produced from stainless-steel, at times aluminium or carbon fibre composite, and that is held towards the diver's again from the harness, and also to which the diver's Main cylinder or cylinders are hooked up. You will find a variety of underwater scooters with different price https://www.saludcapital.gov.co/sitios/VigilanciaSaludPublica/Lists/Contactenos/DispForm.aspx?ID=2972663