Type P ferrule has inner PTFE sealing face, the only material in the fluid path. Two-piece type S ferrule consists of an inner PEEK or ETFE sealing face surrounded by a stainless steel lock ring, with only the inner portion in the fluid path. Choose type P for higher pressures, type S for higher temperatures. Select glass-filled polypropylene compact head fittings available in a range of colors for easy identification. Long head fitting is ideal where accessibility is an issue. Use short thread option for most thread engagement in shallow ports.