Galvanized plated, the exterior and the interface are very smooth, coated the outer screw thread with astiseptic oil. Materials: Rubber, iron, Galvanized Alloy and thickened zinc or chromium plated.Features: Galvanized plated, the exterior and the interface are very smooth, coated the outer screw thread with astiseptic oil.Application: Stuffing Box (TJ ) joint is especially for the use of ship. ...