Engineered best to perform best. Patented non-metallic design with lightweight high-impact polyethylene and amorphous nylon construction for unmatched durability and safety. Resists corrosion and virtually eliminates dangerous rough edges that are common with metal adaptors as they drag along the ground. Fits any aircraft, attaches instantly. Airtight fit, will not shake loose. Maintenance-free, never needs paint, will not dent. Withstands hot and cold temperature extremes. Available in all sizes for every need.