2.2: Polar Covalent Bonds Dipole Moments Chemistry LibreTexts Scubapro Knighthawk BCD with AIR2. Designed for male divers, the Knighthawk BCD boasts of having a low profile, backpack style harness system, integrated weight system, and back mounted buoyancy system. A robust and comfortable back flotation jacket that integrates numerous performance features to deliver outstanding comfort and easy handling. The Knighthawk's retractable air bladder offers ultimate streamlining andsignificantly reduces drag. The Knighthawk is equipped with Scubapro's Balanced Power Inflator, has two rollup zippered pockets, Four Stainless Steel D rings for attachment of accessories, a sturdy Stainless Steel Tank Attachment System, and a comfortable neck roll of soft neoprene with a special foam back pad, making it the BCD of choice.