The Nonmetallic PCA Adaptors offer lightweight, high-impact polyethylene and amorphous nylon construction for durability and safety. The adaptors resist corrosion and help eliminate dangerous rough edges that are common with metal adaptors as they drag along the ground. They fit any aircraft and attach instantly. Their airtight fit, will not shake loose. The adaptors are maintenance-free, never need paint and will not dent. They withstand hot and cold temperature extremes, and are available in all sizes.